Table 2.

EEG spectral power findings in FXS.

Authors	Comparison group (N)	Method	Results
Ethridge et al. [31]	Fragile X syndrome (14) Neurotypical controls (15)	Modified auditory gating	Increased gamma power Decreased gamma phase-locking
Ethridge et al. [29]	Fragile X syndrome (38) Neurotypical controls (40)	Auditory chirp	Increased gamma and theta power Decreased upper alpha power Decreased gamma phase-locking
Ethridge et al. [46]	Fragile X syndrome (41) Neurotypical controls (27)	Passive auditory oddball	Increased gamma power
Rigoulot et al. [35]	Fragile X syndrome (13) Neurotypical controls (24)	Visual habituation	Weaker repetition suppression in FXS
Van der Molen et al. [73]	Fragile X syndrome (8) Neurotypical controls (12)	Resting State	Increased theta power Decreased upper alpha power
Van der Molen et al. [74]	Fragile X syndrome (8) Neurotypical controls (12)	Resting State	Decreased global functional connectivity for upper alpha and beta Increased connectivity for theta (fronto-posterior; frontal-frontal; posterior-posterior)
Wang et al. [72]	Fragile X syndrome (21) Neurotypical controls (21)	Resting State	Increased gamma power Increased spatial spreading of phase-synchronized gamma activity Increased negative theta-to-gamma band amplitude coupling Decreased alpha-to-gamma band amplitude coupling.