The behavioural phenotype of Smith-Magenis syndrome: evidence for a gene-environment interaction.
In Smith-Magenis syndrome, problem behavior is often a way to get adult attention—assess first, then rearrange that payoff.
01Research in Context
What this study did
Matson et al. (2008) watched four children with Smith-Magenis syndrome during everyday activities.
They noted when problem behavior started and what adults did right after.
The goal was to see if adult attention made the behavior happen again.
What they found
In three of the four children, problem behavior came when staff looked away.
As soon as the child acted out, adults gave eye contact, hugs, or words.
The quick jump in attention right after the behavior points to social reinforcement.
How this fits with other research
Wilkinson et al. (1998) and van den Broek et al. (2006) had already listed the odd topographies seen in SMS: nail-yanking, self-hugs, lick-and-flip.
Matson et al. (2008) kept those same behaviors but asked why they keep happening, not just what they look like.
DeFreitas et al. (2024) later used this attention idea in class: they taught a child to wait and paid attention only for waiting, cutting problem behavior.
Garayzábal et al. (2022) seem to disagree at first; they link behavior spikes to poor sleep, not adult attention.
Both can be true: biology sets the stage, but adult attention still pulls the curtain.
Why it matters
Before you write a behavior plan for SMS, run a quick ABC watch.
If eye contact, soothing talk, or hugs show up right after the hit, bite, or scream, you have a social function.
Try giving that attention for calm moments instead, just like DeFreitas did, and save sleep checks for bedtime.
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02At a glance
03Original abstract
BACKGROUND: Behaviour problems and a preference for adult contact are reported to be prominent in the phenotype of Smith-Magenis syndrome. In this study we examined the relationship between social interactions and self-injurious and aggressive/disruptive behaviour in Smith-Magenis syndrome to explore potential operant reinforcement of problem behaviours and thus a gene-environment interaction. METHOD: Observational data on five children with Smith-Magenis syndrome (age range 3 to 13 years) were collected for between 9 and 12 h. The associations between purported phenotypic behaviours and two environmental events (adult attention and demands) were examined using descriptive analysis. RESULTS: All participants engaged in self-injurious behaviour and aggressive/disruptive outbursts. Sequential analyses of aggressive/disruptive outbursts and self-injury revealed that these behaviours were evoked by low levels of adult attention and led to increased levels of attention following the behaviours in three and two participants respectively out of the four for whom this analysis was possible. CONCLUSIONS: Problem behaviour in Smith-Magenis syndrome was evoked by decreased social contact in three out of four children. These data, considered alongside the preference for adult contact and the significantly increased prevalence of these behaviours in Smith-Magenis syndrome, illustrate a potential gene-environment interaction for problem behaviour in this syndrome.
Journal of intellectual disability research : JIDR, 2008 · doi:10.1111/j.1365-2788.2008.01066.x