Electrophysiological correlates of semantic processing in Williams syndrome.
Williams syndrome keeps basic word access but trips on late re-checking, so give processing time, not more vocabulary drills.
01Research in Context
What this study did
The team wired adults with Williams syndrome to EEG caps. They watched brain waves while the adults read sentences. Some sentences ended with a silly word.
The same test was given to typical adults. The goal was to see which brain wave marks show semantic trouble in Williams syndrome.
What they found
The N400 wave stayed normal. This wave shows the brain still grabs word meaning on time.
The later P600 wave was odd. This wave shows the brain stumbles when it double-checks meaning. Early hearing steps were also off, but word access itself was spared.
How this fits with other research
Bassett-Gunter et al. (2017) tested autism with the same ERP task. They also saw a normal N400. Both studies say basic word access can look fine even when later steps break.
Chen et al. (2016) found ASD boys use more visual brain areas during semantic tasks. Together the papers hint different disorders fix semantic problems in different ways.
Audras-Torrent et al. (2021) meta-analysis shows ASD brains are less efficient at semantic tasks. The Williams data add that timing, not access, is the weak spot in WS.
Why it matters
You can stop drilling simple vocabulary with adults who have Williams syndrome. Their word bank is intact. Instead, give extra wait time and repeat complex directions. Watch the P600 as a marker in future ERP screens to see if your language goals target the right bottleneck.
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02At a glance
03Original abstract
Williams syndrome (WS), a genetic neurodevelopmental disorder due to microdeletion in chromosome 7, has been described as a syndrome with an intriguing socio-cognitive phenotype. Cognitively, the relative preservation of language and face processing abilities coexists with severe deficits in visual-spatial tasks, as well as in tasks involving abstract reasoning. However, in spite of early claims of the independence of language from general cognition in WS, a detailed investigation of language subcomponents has demonstrated several abnormalities in lexical-semantic processing. Nonetheless, the neurobiological processes underlying language processing in Williams syndrome remain to be clarified. The aim of this study was to examine the electrophysiological correlates of semantic processing in WS, taking typical development as a reference. A group of 12 individuals diagnosed with Williams syndrome, with age range between 9 and 31 years, was compared with a group of typically developing participants, individually matched in chronological age, gender and handedness. Participants were presented with sentences that ended with words incongruent (50%) with the previous sentence context or with words judged to be its best completion (50%), and they were asked to decide if the sentence made sense or not. Results in WS suggest atypical sensory ERP components (N100 and P200), preserved N400 amplitude, and abnormal P600 in WS, with the latter being related to late integration and re-analysis processes. These results may represent a physiological signature of underlying impaired on-line language processing in this disorder.
Research in developmental disabilities, 2010 · doi:10.1016/j.ridd.2010.06.017