Dataset of action prediction performance and mu rhythm in Williams Syndrome

Dataset of action prediction performance and mu rhythm in healthy and clinical populations of the study entitled "Unveiling the alteration in action processing and mu rhythm in Williams Syndrome" Abstract: Williams syndrome (WS) is a neurodevelopmental disorder marked by social difficulties, which may stem from atypical action processing. We investigated whether individuals with WS show impaired action processing as indexed by electroencephalographic (EEG) mu suppression, a biomarker of action processing. 17 individuals with WS, 17 healthy controls (HC) and 17 individuals with intellectual and developmental disability (IDD) participated in the study. During EEG recording, participants performed a task requiring to predict actions under perceptual ambiguity. In a preceding learning phase, the probability of actions co-occurring with contextual cues was manipulated to establish varying association strengths: high informativeness from very frequent or rare pairings, and moderate informativeness from intermediate ones. A control task required to use contextual cues for predicting moving shapes. HC and WS groups, but not the IDD group, utilized contextual cues to predict action/shape unfolding. EEG data revealed distinct patterns of mu event-related desynchronization (mu-ERD) across groups. In the HC group, mu-ERD was stronger during action than shape prediction and varied with the cue probability, with greater mu-ERD in low vs. high probability trials. In WS and IDD, mu-ERD was attenuated compared to HC. Notably, WS participants exhibited greater mu-ERD for low- than high-probability actions in moderately informative contexts; no modulation was observed in highly informative contexts in either task. In IDD, mu-ERD was not modulated by task or cues predictability. The attenuation and distinct contextual modulation of mu-ERD in WS may reflect anomalies in perception–action mechanisms, potentially linked to impaired simulation of observed actions.