FMR1 and fragile X syndrome: Remarkably similar EEG findings are observed in rodent models of FXS, the Fmr1 knock-out (KO) rat [26] and mouse [27–30], where both developing [29, 30] and adult [27, 28] Fmr1 KO mice exhibit increased gamma-band power in the auditory and frontal cortex compared to wild-type (WT) counterparts.