Rett syndrome: a preliminary analysis of stereotypy, stress, and negative affect.
Hand stereotypy does not rise with stress in Rett syndrome, so pair your session with a physiologic measure like skin temperature.
01Research in Context
What this study did
The team watched girls with Rett syndrome in two short lab sessions. One session added mild social stress. The other was free play.
They counted hand stereotypy and noted any signs of negative affect. They wanted to see if more hand-wringing meant more stress.
What they found
Hand stereotypy stayed the same in both rooms. Negative faces and sounds rose only in the stress room.
So the girls felt more upset, but their hands did not speed up. Stereotypy is not a clear stress meter here.
How this fits with other research
Wilson et al. (2023) extends this work. They found hand temperature drops when autonomic stress is high. That gives you a cheap, quick signal the girls cannot fake.
Larsson et al. (2013) also saw normal heart-rate jumps when the girls simply stood up. Together these papers show Rett bodies react to stress, yet hand stereotypy does not track it.
Wuang et al. (2012) and McQuaid et al. (2024) ran similar lab stress games with autistic youth. They caught cortisol and heart-rate spikes that matched the social load. Again, behavior alone missed the moment.
Why it matters
Stop using hand-wringing as your real-time stress gauge in Rett sessions. Add a quick infrared thermometer or pulse check instead. You will spot true overload before it snowballs and avoid blaming a harmless stereotypy.
Want CEUs on This Topic?
The ABA Clubhouse has 60+ free CEUs — live every Wednesday. Ethics, supervision & clinical topics.
Join Free →Tape a mini infrared thermometer to your clipboard and take each girl’s hand temperature before and after tough tasks.
02At a glance
03Original abstract
Rett syndrome (RTT) is a neurodevelopmental disorder primarily affecting females. It is characterized by apparently normative development of motor and communicative abilities followed by deterioration in these domains. Stereotypic hand movements are one of the core diagnostic criteria for RTT. There is some anecdotal but limited scientific evidence that changes in hand stereotypy may be a sign of increased anxiety or arousal (i.e., a 'stress response') in RTT. Understanding stress responsivity is difficult in RTT because almost all individuals are nonverbal or otherwise severely communicatively impaired. This study used direct behavioral observation to quantify and compare the frequency of hand stereotypy and signs of negative affect during presumed periods of high and low stress associated with functional analysis conditions (negative reinforcement ['escape'] and control ['free play'], respectively) for 5 females with RTT (mean age=17.8; range 4-47). Negative affect was more likely to occur during negative reinforcement ('stress') conditions for each participant whereas hand stereotypies did not differ across conditions for any of the participants. Although preliminary, the results suggest that hand stereotypy may not be a valid behavioral 'stress-response' indicator in females with RTT. Alternatively, the approach we used may have been limited and not sufficient to evoke a stress response. Either way, more work with direct relevance to improving our understanding of hand stereotypy and anxiety in RTT in relation to social context appears warranted.
Research in developmental disabilities, 2014 · doi:10.1016/j.ridd.2014.01.011