Strategies to address challenging behaviour in young children with Down syndrome
Kathleen Feeley and Emily Jones
Children with Down syndrome are at an increased risk for engaging in challenging behaviour that may present problems within community, leisure, and educational settings, and, in many instances, precludes them from accessing these environments. Factors contributing to the occurrence of challenging behaviours include characteristics associated with the Down syndrome behavioural phenotype, increased incidence of illness and sleep disorders, and the way in which individuals in their environment respond to their behaviours. In this paper we describe the use of behaviourally based intervention strategies to address some of the specific challenges often seen in young children with Down syndrome. Through a series of case studies, the effectiveness of evidence-based interventions addressing challenging behaviour is demonstrated.
Feeley KM, Jones EA. Strategies to address challenging behaviour in young children with Down syndrome. Down Syndrome Research and Practice. 2008;12(2);153-163.
At increasing rates, children with Down syndrome are being provided with the same life
experiences as their non-disabled peers. More children with Down syndrome are fully integrated
into the activities of their family and, in many communities, it is commonplace for children
with Down syndrome to be integral members of their schools, neighbourhoods, and workplaces.
However, for many children with Down syndrome (as is the case with other disabilities as well),
success in these environments is hindered by challenging behaviour, defined by Doss and Reichle
as behaviour that results "…in self-injury or injury of others, causes damage to the physical
environment, interferes with the acquisition of new skills, and/or socially isolates the
For many parents, researchers, and practitioners familiar with children with Down syndrome,
challenging behaviour is a common occurrence. Children with Down syndrome are often described as
"stubborn" and "obstinate." In fact, references to challenging behaviour have historically been
seen in the clinical literature and continue to exist today. For example, children with Down
syndrome show higher rates (than typically developing children) of attention problems, social
withdrawal, noncompliance, and compulsions (such as arranging objects and repeating certain
actions)[2,3], as well as high rates of self-talk. With increasing age,
behaviours associated with anxiety, depression, and withdrawal also increase.
Finally, recent research has indicated a pervasive pattern in children with Down syndrome,
present from infancy, of escape and attention motivated challenging behaviours involving
noncompliance and misuse of social behaviours[6,7].
The early onset and distinct presence of challenging behaviour has resulted in its inclusion as
part of the behavioural phenotype (i.e., a unique pattern of strengths and weaknesses) that
characterises Down syndrome. Several other factors, specific to children with Down
syndrome, including sleep disorders[9,10] and increased incidence of illness,
may also increase the likelihood of challenging behaviour in children with Down syndrome.
Fortunately, substantial empirical research demonstrates the effective use of behaviourally
based procedures to assess and intervene on challenging behaviour in individuals with
developmental disabilities (across the ages). However, close examination of the behavioural
intervention literature reveals relatively few applications with children with Down syndrome and
even fewer applications targeting the specific and characteristic challenges presented by these
children. Over the past several years, we have successfully utilised behaviourally based
intervention procedures to address challenging behaviour in young children with Down syndrome.
In all instances, we substantially reduced the extent to which the children engaged in targeted
challenging behaviour, resulting in enhanced performance in inclusive settings.
To illustrate the use of behaviourally based interventions with children with Down syndrome, we
selected five case examples that reflect commonly occurring challenging behaviours among
children with Down syndrome. The cases are categorised according to the type of intervention
strategy. Specifically, intervention strategies addressing setting events and immediate
antecedents, teaching replacement skills (e.g., communication, academic, social), and/or
utilising consequence strategies (e.g., reinforcement) are illustrated. The reader is referred
to Carr et al., Feeley and Jones, and Reichle and Wacker
for more complete discussions of intervention strategies. It is important to note that for each
of these case examples, functional assessments were conducted prior to the start of
intervention. A functional assessment involves the identification of setting events,
antecedents, and consequences associated with the occurrence of challenging behaviour resulting
in a hypothesised function regarding the maintaining consequences for that challenging
behaviour. The reader is referred to O'Neill, Horner, Albin, Storey and Sprague
for a description of functional assessment procedures.
Strategies to address setting events
Events occurring more distally in time from the occurrence of challenging behaviour, or not
directly related to the immediate antecedents or consequences of challenging behaviour, can
affect its likelihood of occurring[16-18]. Such variables have been referred to as
both motivating operations and setting events and are described as
events that occur "…at one point in time [that] may change the likelihood of a targeted
behaviour at a later point in time by momentarily altering the value of consequences" [Ref.19, p.382]. Examples of such events
that are likely to influence behaviour include a change in schedule, illness (e.g., allergies,
virus), and sleep problems[20,21]. For children with Down syndrome, it is
particularly important to consider setting events, because at least some known setting events
such as sleep problems and illnesses, occur at higher rates in
children with Down syndrome, and are, therefore, likely to influence the occurrence of
Interventions can be designed to specifically address setting events. To begin, it is important
to establish that a relationship exists between the setting event and the child's engagement in
challenging behaviour, by, for example, recording both the occurrence of the setting event(s) of
concern and the child's behaviour. Consider a particular child whose challenging behaviour may
be directly associated with the onset of an illness. The child's caregivers note the extent to
which the child experiences symptoms of a specific illness (e.g., runny nose, fatigue, loose
bowel movements) and then, they, as well as other caregivers (e.g., educators), note the
occurrence of challenging behaviour. A relationship between challenging behaviour and a setting
event is suggested if higher frequencies of challenging behaviour occur on the day/time(s) when
the symptoms of illness were present.
Once it has been determined that a relationship exists between the setting event and challenging
behaviour, a mechanism for caregivers to share with other caregivers (e.g., school personnel)
when a child has experienced a particular setting event (e.g., lack of sleep, missed meal,
parent away on a business trip) can be developed. A checklist, note, or regular phone call
between caregivers can be used to communicate the occurrence setting event(s). This allows for
the consideration of several interventions designed to ameliorate the effects of the specific
setting event[20,23]. For example, in the presence of the setting event (e.g., day on
which the symptoms of an illness start to become apparent), corresponding interventions may be
implemented, including decreasing the likelihood of antecedents that trigger challenging
behaviour and delivering higher rates of reinforcement. Both of these strategies were used with
Nathan in his kindergarten class.
Nathan was a 5 year old boy with Down syndrome enrolled in a general education kindergarten
class. In addition to Nathan rising very early in the morning (often just after 5:00 a.m.), he
was the third of four children in a family that had a very busy lifestyle (e.g., frequent visits
to extended family, attendance at numerous athletic events of older siblings). Nathan's
classroom staff began to notice that, on some days, Nathan appeared tired and had a tendency to
engage in challenging behaviour (e.g., noncompliance, pushing educational materials away).
Subsequently, they recorded the occurrence of Nathan's challenging behaviour. At this point,
Nathan's parents were asked to place a note in his communication book (i.e., a small notebook
dedicated to correspondence between the school staff and Nathan's parents) to indicate whether
Nathan had a full night's sleep the previous evening. Within a short period of time, Nathan's
classroom staff and parents were able to verify that noncompliant behaviour (i.e., refusal to
respond to simple requests) occurred more often during academic tasks (e.g., letter
identification, counting) on days when Nathan did not get enough sleep the evening prior.
Box 1 | An excerpt from Nathan's communication notebook prior to intervention
Nathan had a very difficult time in resource room today. He kept asking to go home (he didn't
feel warm) and became very noncompliant after a simple request. Do you think Nathan was just a
little off today? Or maybe something else?
Nathan's education team implemented a package intervention to address the setting event, lack of
sleep. Nathan's parents continued to either write a note in the communication book or phone the
school with a message for Nathan's teaching assistant indicating when Nathan did not get enough
sleep. On the days Nathan did not sleep enough, the classroom staff decreased academic demands
and increased access to highly preferred activities. Specifically, Nathan's teachers asked him
to complete fewer tasks within academic activities, while at the same time they increased
opportunities to play "games" in which instructional targets were incorporated. For example,
instead of completing a workbook page of counting tasks, Nathan was engaged in a table top
bowling game during which he counted the number of pins. This allowed his interventionist to
continue to work on academic skills, however, because it was done within an activity that was
highly preferred, Nathan did not engage in challenging behaviour. Additionally, interacting with
Nathan in this manner (fewer task demands and increased access to preferred activities) resulted
in Nathan receiving an increased rate of reinforcement. Thus, there were many more opportunities
for staff to praise (i.e., verbally or with a high five or handshake) than would have been
typically delivered had these specific strategies not been in place.
Nathan's parents and teachers continued to document in his home-school communication notebook
the occurrence of disruptions in sleep and challenging behaviour.
Box 2 | Excerpts from Nathan's communication notebook during intervention
Nathan didn't get much sleep last night. We were out late and he was up very early (5:00). We
hope his (and your) day goes smoothly.
Thanks for the note. Nathan did seem tired early on, but he had a great day. While in resource
room, we played the matching game. Have a nice afternoon.
depicts an excerpt of anecdotal information when
setting event intervention strategies were not implemented. As illustrated in the note from
Nathan's teaching assistant (Rachel) to Nathan's mother (Ellen), Nathan had a very difficult
day. On this day, Nathan had not slept well the night before, however school staff were not
informed, and intervention strategies to prevent challenging behaviour were not implemented.
Box 2 depicts Nathan's
mother (Ellen) alerting Nathan's teaching assistant to the fact that he had not slept well the
After receiving the note that Nathan did not sleep enough the night before,
Nathan's teaching assistant (Rachel) indicates they played a matching game instead of engaging
in the typical academic demands (antecedents for challenging behaviour when Nathan had not slept
As well, Nathan had a "great day." Because of their effectiveness, Nathan's classroom
staff continued to use these setting event intervention strategies throughout the remainder of
the school year noting that they resulted in substantial improvement in Nathan's behaviour.
There are some events, such as sleep disorders and illnesses, that have a high incidence of
occurrence in children with Down syndrome, and therefore, should be given careful consideration
when addressing challenging behaviours. In addition, there may be very individualised setting
events (e.g., death in the family, transition to new school) that increase the likelihood of
challenging behaviour in specific children. Thus, both of these types of setting events should
be carefully monitored.
When setting events occur outside of the school setting, as happened with Nathan, communication
between home and school is an important component of effective intervention. However, caregivers
may not be in a position to report such events. Although this presents a particular challenge,
interventionists can begin to look for precursor behaviours that may be associated with the
occurrence of the setting event and challenging behaviour. For example, if Nathan's parents were
not able to regularly communicate about his sleep patterns, interventionists might look for
signs of insufficient sleep when he arrives at school (e.g., dark circles under Nathan's eyes,
slouching in his seat on the school bus). Additionally, if the child has sufficient
communication skills, upon arrival at school he/she can be asked about the occurrence of the
setting event (e.g., "Did you sleep well last night?" "What time did you wake this morning?").
If the child's communication skills are limited, interventionists may develop graphic
representations of setting events to communicate their occurrence (e.g., a photo or drawing
depicting a person who is overly tired).
Antecedent based strategies
Similar to setting event intervention strategies, antecedent intervention strategies
are implemented prior to the occurrence of challenging behaviour in an effort to decrease the
likelihood that challenging behaviour will occur. To implement antecedent based strategies, a
functional behaviour assessment should be implemented in which the challenging behaviour and
associated environmental events (both antecedents and consequences) are documented. That is,
throughout the time period of concern (e.g., academic lesson, transition from one place to
another, at home during mealtime), data are recorded, including the activity and specific events
that occurred just prior to the occurrence of challenging behaviour (e.g., type of request made,
by whom, etc.). This information can reveal when the challenging behaviour is likely to occur.
For example, on several occasions, following a request (antecedent) to put his belongings (e.g.,
lunch box, jacket) in the coat closet, Tim refused and dropped his belongings to the floor
(behaviour), resulting in his teacher putting them away for him (consequence). Each day, when
another child, Meredith, was asked to clean up after snack (antecedent), she responded by crying
(behaviour), which resulted in her classmates cleaning up for her (consequence). Thus, a
functional assessment reveals a pattern of particular antecedents (e.g., requests) that reliably
predict specific challenging behaviours (e.g., noncompliance, dropping to the floor, crying).
Once the specific antecedents associated with challenging behaviour have been identified,
several strategies can be implemented just prior to the delivery of the antecedent, preventing
challenging behaviour from occurring. The research literature has demonstrated the effective use
of a number of antecedent strategies, two of which were used with Cody in his
Cody was a 3 year 10 month old boy with Down syndrome who attended a preschool programme where
he received a combination of intensive instruction and participation in an integrated preschool
class in which half of the children had mild disabilities and half were typically developing. In
his preschool class, Cody had a tendency to engage in challenging behaviour that consisted of
refusal to comply with teacher requests (i.e., ignoring the requests and dropping to the floor).
A functional assessment revealed Cody engaged in noncompliant behaviour often accompanied with
dropping to the floor when his teachers requested that he transition from one activity to
another (i.e., the antecedent). In many instances, following engagement in the challenging
behaviour, Cody ultimately avoided transitioning to the next activity.
Cody's education team chose to implement two different antecedent interventions prior to
requesting that Cody transition. One of the interventions, prespecified reinforcer,
involves informing the child what she/he will receive upon completion of a specific task (in
this case, the transition). For Cody, the reinforcing items (e.g., computer games, stickers,
crayons, and bubbles) were chosen based upon the specific transition. For example, Cody
consistently engaged in challenging behaviour when asked to come in from the playground. As a
result, one of his favourite activities in his classroom, playing on the computer, was
prespecified prior to requesting him to enter the school (e.g., "Cody, we have your favourite
game all ready for you to play on the computer. Quick let's get on line and go inside so you can
take a turn.").
Another intervention, preferred item/activity as a distractor, involves offering the child a
preferred item to distract him/her from the aversiveness of the request. For
example, when transitioning between locations within the classroom, Cody's teacher asked him to
carry supplies (the preferred item) from one instructional centre to the other. When
transitioning between rooms, Cody's teacher asked him to be the "Whistle Blower" (i.e., the
student who blows the class whistle in order to gain the students' attention). The use of either
the prespecified reinforcer or preferred item as distracter strategy was at the teachers'
discretion and was typically based on the availability of preferred items to serve as
distracting stimuli during the transition.
Figure 1 |
Percentage of transitions during which Cody did not display challenging
The effect of these intervention strategies on Cody's challenging behaviour is illustrated in Figure 1. Data were
recorded during five specific transitions both within and outside of his classroom each day
(i.e., moving from free time in the classroom to group lessons, between three different centres
within the classroom, and from the playground to the classroom). During baseline, Cody complied
with only 0-20% of transitions. During intervention, compliance increased to 80-100% of
transitions. Over time, Cody's classroom staff were able to fade the use of the interventions,
resulting in Cody complying with requests to transition (in the absence of any intervention
techniques) without engaging in challenging behaviour (labelled
Maintenance in Figure 1).
Prespecified reinforcer and preferred item as distractor are only two of several different
antecedent strategies, including choice, high probability request sequence, and offer of
collaboration. Choice involves presenting the child with options prior to the presentation of
the antecedent event that triggers challenging behaviour (e.g.
27-29). For Cody, his teachers could have
provided him with a choice of centres (e.g., "Would you like to go to the drawing centre or the
counting centre?") when presenting the request to transition (the antecedent) to centre time.
Another antecedent strategy that could have been applied by Cody's team is that of a high
probability request sequence, in which the interventionist delivers a series of requests to
which the child is highly likely to comply (each followed by the delivery of reinforcement)
followed by a request to which the child has a low probability of responding
(e.g. Refs. 19,30,31). To
illustrate, Cody's teacher could have asked him to complete several acts he could easily and
readily perform (e.g., "Touch your nose," "Show me a thumbs up," and "Give me five") each
followed by the delivery of verbal praise (e.g., "Great job Cody") and then delivered the low
probability request (i.e., the request to transition, such as "Let's go to the counting
centre."). An offer of collaboration entails the interventionist offering to collaborate with
the child on the task which is likely to trigger challenging behaviour. For
example, when transitioning between centres, instead of saying, "Turn off the computer and go to
the counting centre," the teacher might say, "Let's press the off button together so we can go
to the counting centre."
It is important to note that antecedent strategies are most effective when used prior to the
occurrence of challenging behaviour. Too often caregivers and interventionists "forget" to use
the antecedent intervention until after the challenging behaviour occurs. Therefore, in order to
prevent the challenging behaviour from occurring, one should remember to use them proactively,
that is, prior to delivering the antecedent that is likely to trigger the challenging behaviour.
Skill building strategies
In many instances, challenging behaviour is related to the child's limited repertoire of more
acceptable responses and, often, these responses are communicative in nature. For example, a
child may not have the expressive language to request a break, thus, he/she may throw materials
as a means of indicating he/she is finished with the activity. A child may not have an
appropriate means to get a teacher's attention, thus, he/she may fidget in his/her chair so
staff in the classroom will stand in close proximity. These examples illustrate instances in
which children do not have a communicative response to get what they want and, thus, could
benefit from being taught a replacement response (i.e., a new skill such as signing for "break"
or tapping a teacher's shoulder) [13,32].
In other situations, children may have appropriate communicative responses in their repertoire,
but use them in situations where they are not appropriate. For example, in some situations, such
as when a family member arrives at a child's house, it is appropriate for the child to greet
them with a big hug. In other situations, such as when a delivery person arrives at the child's
house with pizza, it is appropriate to say "Hello" and perhaps shake the person's hand, but it
would be inappropriate to give the pizza delivery person a big hug. These subtle discriminations
may prove difficult for children with Down syndrome. Not only do these situations require
discrimination skills, they also require a large repertoire of social behaviours on the part of
the child that include multiple forms of greetings (e.g., a high five, wave, and handshake),
that they can use in place of an affectionate greeting (e.g., hug).
Importantly, it is not the specific response (in this case, an affectionate greeting) that is
challenging, but the context in which it occurs that may make it problematic. Therefore, it is
important that children with Down syndrome be systematically taught not only to discriminate
when certain behaviours should be emitted, but also alternative responses so they are prepared
to respond in various situations. The following case study illustrates the instruction of a
greeting (i.e., handshake) to replace Michael's hugging of strangers.
Michael was a 4 year old boy with Down syndrome attending a preschool programme where he spent
part of his day receiving intensive instruction and part of his day in a community preschool.
Michael's family was concerned about his propensity to greet unfamiliar adult males by hugging
them, both in public (e.g., patients in doctors' offices) and in his home (e.g., pizza delivery
person). Michael's mother recorded his greeting behaviour in the presence of unfamiliar males in
two settings: in the home when delivery person arrived and in the community (e.g., doctor's
To expand upon Michael's greeting repertoire, he was taught to shake hands. Initially, Michael
was taught to shake hands with individuals with whom he was familiar, within his preschool
programme. Intervention took place within a discrete trial format (i.e., the presentation of
multiple teacher directed instructional opportunities in close temporal proximity, with the use
of specific prompts, followed by the delivery of reinforcing consequences).
During intervention, a familiar adult entered Michael's instructional area, at which point his
teaching assistant prompted Michael to shake hands by saying, "Michael, shake [name's] hand."
When Michael responded by shaking the hand of the familiar adult, reinforcement (e.g., high
five, verbal praise) was delivered. Any incorrect response (e.g., attempting to hug or climb in
the adult's lap) was immediately interrupted, and Michael was physically prompted to shake
hands. At least 10 intervention opportunities were conducted per school day until Michael's
performance met criterion for mastery (i.e., shook the familiar adult's hand during 80% or more
of the opportunities on a given day without physical prompting).
After Michael's performance met this criterion, intervention was conducted while taking walks
throughout the preschool setting rather than just within his classroom. Upon approaching a
familiar male (e.g., male teacher in Michael's programme, familiar parent of another child), his
teaching assistant delivered the verbal prompt, "There's [name]. Michael, shake his hand."
Between 3 and 5 intervention opportunities were conducted at least three days per week. Correct
responses were reinforced. Incorrect responses were interrupted and Michael was physically
prompted to shake hands.
Once Michael's performance met criterion (i.e., shook the familiar adult's hand on walks in his
preschool on 80% or more of the opportunities without physical prompting), intervention
opportunities involved unfamiliar males. Michael's teacher and teacher's assistants set up
situations within the preschool in which unfamiliar males (e.g., fathers of children unfamiliar
to Michael, staff who worked in other programmes within the building or who were visiting from
other buildings) approached Michael and his teaching assistant. Prompting, reinforcement, and
correction procedures were delivered in the same manner as during prior intervention. Due to the
planning involved in these teaching opportunities, only 3-5 opportunities were provided each
week. Mom reported that after intervention, Michael appropriately greeted both familiar and
unfamiliar individuals at home and within his community.
There is a perception on the part of many people that children with Down syndrome are
affectionate and loving. It has also been hypothesised that others respond differently to
children with Down syndrome and their affectionate behaviour. Clinically, we have seen some
children with Down syndrome treated differently than their peers without disabilities, such that
they are permitted and encouraged to engage in affectionate behaviour that would be unacceptable
from a typically developing child of the same chronological age. For example, in several
educational settings, we have observed classroom staff requesting hugs from the children with
Down syndrome or permitting children with Down syndrome to sit on their laps, yet these
interactions did not occur with the typically developing children within the same setting.
Although endearing, it is very important that children with Down syndrome be treated in a
similar fashion to their non-disabled peers. Thus, not only is it important to teach children
with Down syndrome appropriate behaviours in corresponding situations from an early age, but to
address this differential treatment on the part of adults in their environment.
Not being taught when to refrain from engaging in certain displays of affection may also
negatively affect the child's relationships with their peers. Same age peers of children with
Down syndrome may not always respond well to affectionate approaches. At first, a peer may
respond by saying "Move back" or "Don't hug me." If the child with Down syndrome persists, a
peer may become angry and/or begin to avoid interacting with the child with Down syndrome.
Therefore, specific instruction in appropriate ways to greet peers as well as how to respond to
requests made by those peers is important. Finally, identifying and teaching those responses
that are socially acceptable within each child's social circle (e.g., high five, thumbs up,
fancy handshake) will likely prove beneficial for the child with Down syndrome.
Consequence based strategies
Once an antecedent associated with challenging behaviour has occurred, a child may either engage
in the challenging behaviour or refrain from engaging in that challenging behaviour. The
consequence delivered by the caregiver and/or interventionist at this juncture impacts how the
child responds in the future. In past research, to decrease challenging behaviour,
interventionists relied heavily on consequence strategies implemented after the challenging
behaviour occurred (i.e., punishment procedures). Alternatively, interventionists can rely on
positive consequence strategies, implemented when the challenging behaviour is not emitted. That
is, the antecedent occurs and, if the child refrains from engaging in challenging behaviour,
specific consequences are delivered that increase the likelihood the child will refrain from
emitting the challenging behaviour in the future. This type of consequence strategy is termed
Differential reinforcement procedures include the use of reinforcement following the occurrence
of an alternative appropriate behaviour (DRA), emitted in place of the challenging behaviour
and the use of reinforcement following the omission of the behaviour (DRO). The following case
studies illustrate the use of differential reinforcement procedures to address escape motivated
behaviour in Sam and self-stimulatory behaviour in Paul.
A strategy to address escape motivated behaviour
Given the high rates of escape motivated challenging behaviour present even in young children
with Down syndrome, it is often necessary to incorporate consequence procedures so the child can
benefit from educational experiences. One easily implemented application of differential
reinforcement of alternative behaviour (DRA) is within a token system. A token system involves
the use of a symbol or token delivered as a consequence for appropriate behaviour that can be
traded for backup reinforcers[35,36]. As illustrated in our case example of Sam, the
use of a token system can begin at a very young age.
Sam was 2 years 6 months old and was receiving early intervention services within his home. In
addition to receiving physical, speech, and occupational therapy on a weekly basis, Sam received
two 45 minute sessions of intervention implemented by a special educator. During these sessions,
his interventionist addressed expressive and receptive communication, as well as play skills
(i.e., turning the page of a book, activating buttons to play music, engaging in multi-step play
sequences). During intervention sessions, Sam had a tendency to engage in behaviour that his
interventionist and mother believed interfered with his acquisition of skills. During
intervention activities, Sam refused to respond to the interventionist by turning away from her,
covered his face, and/or threw the instructional materials (i.e., toys, pictures), resulting in
avoidance of some of his intervention activities.
Sam's education team decided to implement a token reinforcement system during these intervention
sessions. This involved the delivery of tokens following appropriate responses (i.e., imitating
speech sounds, pointing to common objects, and imitating play behaviours) that could be traded
for a backup reinforcer (e.g., access to a favourite book). Sam's team chose small pictures (4
cm by 4 cm) of Blue's CluesTM characters as tokens and, after laminating them,
attached the tokens to a board with VelcroTM. Sam's mother identified several
preferred items that could be used as backup reinforcers (e.g., favourite books) and his
interventionist often brought toys (e.g., electronic toys, barn and animals) that also
functioned as reinforcers for other target behaviours.
Initially, the goal was for Sam to earn three tokens before trading them in for access to one of
his backup reinforcers. At the beginning of intervention, two tokens were placed on the board.
An instruction was given to Sam (e.g., "Show me the [object name]" during receptive object
identification tasks) and, as soon as Sam responded appropriately, the last of the three tokens
was placed on the board. Sam's interventionist delivered verbal reinforcement (e.g., "That was
terrific!") and then provided him with access to the back up reinforcer (e.g., reading him a few
pages from a book). Across teaching opportunities, Sam's interventionist began with fewer Blue's
CluesTM tokens (i.e., one and then zero) attached to the board at the start of the
intervention session so that Sam had to respond to more teaching opportunities (i.e., two and
then three teaching opportunities) prior to receiving access to his reinforcer. As Sam's
challenging behaviour decreased, the number of tokens Sam was required to earn (and hence the
number of teaching opportunities implemented) before receiving his back up reinforcer was
increased from three to five.
The concern of Sam's mother and his interventionists was that Sam's noncompliance interfered
with his acquisition of skills because it decreased the number of teaching opportunities that
could be provided when so much time was spent dealing with challenging behaviour. With the token
system in place, Sam's intervention sessions were more productive with an increase in number of
intervention opportunities and less time spent dealing with Sam's challenging behaviour.
Additionally, with increased intervention opportunities, Sam began to master skills at a faster
rate. The use of the token system therefore resulted in Sam remaining on task for more
intervention opportunities and spending less time engaging in challenging behaviour.
Token systems have been used extensively to address the performance of a variety of behaviours
in individuals with and without disabilities. Tokens can take multiple forms. For example, they
can be preferred pictures, as with Sam, whose tokens were pictures of a favourite character. In
the case of a child who has difficulty attending during story time and whose backup reinforcer
is colouring, the individual crayons can act as tokens. For example, for each 3 minute time
period of attending during story time, a crayon (i.e., token) can be discretely placed in a box.
Once the child has remained on task for the determined amount of time (e.g., 15 minutes), the
box of crayons (i.e., backup reinforcer) can be given to the child for him to use. Tokens can
also consist of the puzzle pieces of a picture of the backup reinforcer. In this situation, once
the picture of the backup reinforcers is complete (i.e., all the pieces or tokens have been
earned), the backup reinforcer itself is provided.
Another consideration with token systems is the criterion for earning the backup reinforcer. It
is important to set the criterion at a point the child can achieve. For example, the child may
be required to earn only 4 of the 5 possible tokens to receive his/her backup reinforcer. The
use of a token system can be gradually faded, such that tokens are delivered intermittently,
rather than for each occurrence of a target behaviour. For example, a child may be earning
tokens for appropriately transitioning between activities. Instead of having to successfully
transition on one occasion to earn each token, fading the token system might involve requiring
the child to transition twice before earning a token. As the child is successful, the number of
transitions can be further increased (to three, four, etc.). Eventually, the expectations might
be that if all transitions are successful for the day, a token is delivered and then traded in
at the end of the week.
Tokens can often be delivered in a discreet manner, an important consideration when children are
in inclusive environments. Children can even learn to deliver their own tokens (called
self-management) [e.g. Ref. 37] increasing the discreetness of the token system. For example, a child can place
checkmarks (tokens) on a paper in his notebook during classroom lessons. The child may
eventually be taught to judge when he/she has reached criteria for earning tokens and access
his/her backup reinforcer with little adult intervention.
A strategy to address self-stimulatory behaviour
Although children with Down syndrome tend to engage in high rates of escape and attention
motivated challenging behaviour, there are other challenging behaviours whose function is often
related to pleasurable sensory feedback (i.e., self-stimulatory behaviour), that can become
particularly problematic. Engaging in self-stimulatory behaviour may decrease a child's
engagement with the environment resulting in valuable learning opportunities being missed.
Additionally, self-stimulatory behaviour may result in social isolation. For example, the child
may be ostracised by his peers for such behaviours (e.g., putting his hand in his mouth, making
peculiar noises, or using objects/toys in an unconventional manner [e.g., waving a toy car in
front of his/her eyes]).
Differential reinforcement of the omission of behaviour (DRO) is often used as a consequence
strategy to address self-stimulatory behaviour
(e.g. Ref. 38). DRO involves systematically delivering reinforcement
following a specified interval of time during which the target behaviour is not emitted.
DRO was used with Paul to address an oral self-stimulatory behaviour.
Paul was a 3 year old boy with Down syndrome who attended a preschool programme in which he
received intensive intervention for 2.5 hours each morning. In the afternoon, he attended an
integrated preschool class in which half of the children had mild disabilities and half were
typically developing. Paul engaged in a challenging behaviour that took the form of tongue
protrusion while at the same time making a "clicking" noise. This behaviour was stigmatising,
disruptive, and often precluded Paul from attending during group lessons. Paul engaged in this
behaviour for 75-88% of the time he was observed during a series of his daily activities within
his preschool. A functional assessment indicated this behaviour served a self-stimulatory
function, that is, Paul engaged in the behaviour in the presence or absence of other individuals
and the behaviour did not result in any external reinforcers (e.g., attention, access to
preferred items, or escape from a task).
Paul's education team decided to implement a differential reinforcement programme in which he
was not only reinforced for the absence of the behaviour (DRO), but a mild correction procedure
was implemented when the behaviour did occur. DRO involved delivering reinforcement in the form
of praise (e.g., "Wow, you look terrific Paul", "That's looking like a big boy Paul!") or
physical interaction (e.g., high five) if Paul did not engage in the tongue protrusion and
clicking during a specified time interval. The correction procedure consisted of Paul's teaching
assistant placing her hand near (but not touching) his chin and saying, in a gentle voice, "uh,
uh," if Paul engaged in tongue protrusion and clicking. This correction procedure was chosen
because it immediately resulted in the cessation of the behaviour (while other correction
procedures such as only saying "uh uh" did not have the same effect) and it was a procedure with
which Paul's parents were comfortable having educational staff perform.
During baseline (i.e., prior to intervention), Paul's self-stimulatory behaviour occurred at
such a high rate that a 30 second time interval was selected to begin intervention (30 seconds
was the longest period of time that Paul would refrain from engaging in self-stimulatory
behaviour). If Paul did not engage in tongue protrusion with clicking for 30 seconds, his
teaching assistant delivered reinforcement in the form of verbal praise (e.g., "Wow, you're a
handsome guy", "You look terrific," and/or physical interaction, such as rubbing his arm or
giving him a high five). If the behaviour did occur, Paul's teaching assistant immediately
placed her hand near his chin and, in a quiet voice said, "uh uh," and Paul did not receive
reinforcement for that 30 second interval.
As Paul's tongue clicking behaviour decreased when reinforcement was delivered at 30 second
intervals, the interval was increased to 60 seconds. Reinforcement was eventually completely
faded during all classroom activities, with one exception. Paul's team noticed the only time
Paul continued to engage in the tongue protrusion behaviour was during difficult fine motor
tasks (e.g., cutting, stringing beads). It was during these time periods only, that his teachers
continued to deliver specific reinforcement for the omission of his self-stimulatory behaviour.
Figure 2 |
Percentage of intervals during which Paul displayed oral self-stimulatory
Figure 2 displays Paul's progress. During
baseline Paul engaged in this behaviour for 75-88% of the time he was observed. Within a week of
starting intervention, Paul was successfully participating in all classroom activities (with the
exception of fine motor activities) with very low levels (10-16% of 60 second intervals) of the
self-stimulatory behaviour. Thus, the rigorous implementation of differential reinforcement
intervention resulted in a decrease in Paul's challenging behaviour to the extent that it was no
longer a concern of his parents or the any of the members of his educational team.
Self-stimulatory behaviours can take several forms, including oral behaviours such as that in
which Paul engaged (e.g., tongue clicking, lip licking, mouthing objects), whole body behaviours
(e.g., rocking), and inappropriate manipulation of objects (e.g., repeatedly shaking a toy car).
Differential reinforcement procedures have been successfully applied resulting in decreases in
such behaviours to a level at which they are no longer considered a problem (either very low
rates of occurrence or no occurrences). While Paul's intervention involved a differential
reinforcement of other behaviour (DRO), other differential reinforcement procedures such as
those that identify a specific alternative or incompatible behaviour to reinforce (instead of
the challenging behaviour) may also be successfully applied. For example, if a child engages in
a self-stimulatory behaviour using objects in his/her environment, he/she can be systematically
reinforced for engaging in the appropriate action. Writing with a pen or marker can be
reinforced as an incompatible behaviour with chewing on the end of the writing instrument.
Decreasing self-stimulatory behaviours is particularly important as the presence of such
behaviours often interferes with learning and leads to further social isolation or
stigmatisation of a child with Down syndrome.
Each of these cases was chosen to illustrate the use of evidence-based intervention procedures
that effectively decreased challenging behaviours in children with Down syndrome. First, each
case example illustrates the application of a specific intervention strategy. However,
individual intervention strategies such as those described here are often applied in combination
as a package positive behaviour support plan (e.g. Ref. 13). Positive behaviour support plans consist of intervention
strategies combined to address setting events, antecedents, skill building, and consequences
related to challenging behaviour. Consider a child who engages in escape motivated challenging
behaviour during morning circle and is more likely to do so on days when his allergies are
bothering him. A positive behaviour support plan might include increasing reinforcement during
circle time on days when he shows signs of allergy (e.g., red runny nose) (i.e., setting event
strategy), and presenting him with a preferred item as distractor during that activity (e.g.,
having the child hold the book while the teacher reads) (i.e., antecedent strategy). The child
could also be systematically taught to ask to leave circle time (rather than engaging in
challenging behaviour to escape circle time) (i.e., skill building) and his interventionists
could deliver specific consequences for appropriate circle time behaviour (e.g., token system)
(i.e., consequence strategy). The effectiveness of individual intervention strategies as
illustrated in these case examples suggests the use of combined intervention packages for
children with Down syndrome will be similarly effective.
Figure 3 | Components of a Positive Behaviour Support Plan with example interventions
illustrated by each of the case studies presented.
Figure 3 illustrates the four components of a positive behaviour
support plan and intervention strategies illustrated in the previous case examples.
Second, the case examples were chosen to specifically reflect some of the significant factors
(e.g., sleep problems, escape motivated behaviour) associated with challenging behaviour in
children with Down syndrome. Continued research is warranted to examine additional applications
of behaviourally based intervention procedures to address the specific characteristics
associated with Down syndrome. The early onset of escape and attention seeking challenging
behaviour[6,7] has been included in the behavioural phenotype that characterises Down
syndrome. The early demonstration of such challenging behaviour can significantly
and negatively impact outcomes for children with Down syndrome. Therefore, developing effective
intervention strategies that can be used from a very young age, such as the token system with
Sam, is imperative to circumvent the negative outcomes associated with such early behaviours. In
fact, as families and professionals become well versed in effective intervention strategies,
intervention can be implemented automatically so that significant challenging behaviour never
enters the child's repertoire.
Finally, in these case examples the presence of challenging behaviour significantly impacted the
children's access to and success in typical environments (e.g., general education classroom,
Doctor's office). The decrease in challenging behaviour as a result of the use of behaviourally
based intervention strategies led to increased successful opportunities to participate in
typical environments. Thus, the application of evidence-based assessment and intervention
strategies to address challenging behaviour in children with Down syndrome is important to
ensure successful inclusion in community settings without risk of removal based on challenging
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We would like to acknowledge the children and families who participated in these
case studies, as well as the professionals (teachers and teaching assistants),
who implemented the procedures.
Received: 21 September 2006; Accepted 14 February 2007; Published online: 6