Adaptive and maladaptive behavior in children with Smith-Magenis Syndrome.

van den Broek et al. (2006) looked at a small group of children with Smith-Magenis Syndrome. They gave standard tests of daily living, communication, and social skills. They also watched for stereotypy and self-injury.

The team wanted a full picture of how these kids adapt at home and school.

Every child scored below average on every adaptive area. All showed repeated hand-flaps, body-rock, or self-hits. Nail-yanking and skin-picking were common.

The pattern was so steady the authors call it a behavioral phenotype.

Wilkinson et al. (1998) first mapped the unique SMS self-injuries like nail-yanking. van den Broek et al. (2006) later confirmed and added the low adaptive scores.

Matson et al. (2008) then showed these same behaviors spike when adults look away and stop when adults give attention. Their data give an operant reason for the phenotype C described.

Poppes et al. (2010) surveyed adults with profound ID and found staff rated similar SIB as minor. That seems to clash with the severe SMS picture, but the groups differ. SMS brings sharper sleep loss and sensory issues that magnify behavior.

DeFreitas et al. (2024) prove you can still teach these kids useful skills. A five-minute classroom plan raised delay tolerance from half a minute to five. The bleak profile in C et al. is not unchangeable.

If you see a new SMS referral, expect broad skill deficits plus high-rate SIB and stereotypy. Screen sleep first (Elena et al. 2022). Then run a quick attention test (L et al. 2008) to see if problem behavior is socially maintained. Use that data to build an intervention that teaches waiting, communicating, and tolerating denial (DeFreitas et al. 2024). Plan for intensity, but know change is possible.