Investigation of the relationship between electrodermal and behavioural responses to executive tasks in Prader-Willi syndrome: An event-related experiment.
In PWS, poor executive control and abnormal skin conductance appear together but do not track each other, so EDA cannot replace behavioral testing.
01Research in Context
What this study did
Researchers asked adults with Prader-Willi syndrome to do two computer games that test executive skills. One game measured how well they could stop themselves from pressing the wrong key. The other game measured how well they could update their memory with new numbers.
While the adults played, the team also recorded tiny changes in sweat on their fingers. This skin response shows how active their sympathetic nervous system is.
What they found
The PWS group made more errors and responded more slowly than healthy adults on both games. Their skin showed unusual sweat patterns, but these patterns did not line up with how badly they did on the tasks.
In short, poor executive skills and odd skin conductance happen together in PWS, yet one does not predict the other.
How this fits with other research
Stancliffe et al. (2007) and Chevalère et al. (2015) already showed that people with PWS struggle with executive tasks. The new study agrees, but adds the twist that skin conductance cannot stand in for behavioral scores.
Laposa et al. (2017) found that, in children with autism, higher skin-conductance variability went hand in hand with worse symptoms. The PWS study looks similar on the surface, yet finds no link between sweat response and task errors. The difference likely comes from diagnosis: ASD children may show coupled arousal-behavior patterns, while PWS adults do not.
Kirshner et al. (2016) saw stronger sweat reactions in kids with cerebral palsy during negative game blocks. Again, the PWS adults reacted differently, suggesting each developmental disability carries its own autonomic signature.
Why it matters
If you assess a client with Prader-Willi syndrome, do not trust a calm or excited skin-conductance reading as proof of good or bad executive control. You still need direct tests like stop-signal or n-back tasks. Keep tasks short and provide extra practice trials, because working memory updating is especially fragile in this population.
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02At a glance
03Original abstract
BACKGROUND: Recent work suggests that maladaptive behaviors in genetic developmental disorders may emerge from autonomic dysfunctions impacting higher order executive functions. In Prader-Willi syndrome (PWS), executive functions are not well understood and investigations of possible underlying causes at the autonomic level are lacking. AIMS: This study aimed at clarifying the status of inhibition and working memory updating functions in PWS and searched for sympathetic signatures as well as to examine their links with executive performance. METHODS AND PROCEDURES: The performance of thirty adults with PWS was compared to that of thirty healthy adults on two tasks assessing inhibition and working memory updating while electrodermal activity (EDA) was recorded. OUTCOMES AND RESULTS: PWS adults underperformed healthy adults in the inhibition and the working memory updating tasks and showed abnormal skin conductance responses. Distinct EDA have been found in PWS and healthy adults. Furthermore, while EDA reflected distinct cognitive processes, correlations between electrodermal and behavioural data were absent when examining the two groups separately. CONCLUSIONS AND IMPLICATIONS: PWS is associated with a slight impairment of inhibition and a severe impairment of working memory updating. Furthermore, there are specific sympathetic autonomic signatures in PWS that do not present straightforward links with executive dysfunctions.
Research in developmental disabilities, 2019 · doi:10.1016/j.ridd.2018.11.013