Increased cortical reactivity to repeated tones at 8 months in infants with later ASD

a Amplitude difference of 40–60？Hz evoked gamma in the right tempo-parietal electrodes between Standard 3 and Standard 1. b Difference plots of the gamma responses to the repetition of standard tone (Standard3？？？Standard1) in 40–60？Hz evoked gamma in right tempo-parietal electrodes. It appears while the LR group shows a clear repetition suppression, the HR-ASD group shows an increase in gamma activation. c 3D Scalp maps of the difference in total 40–60？Hz gamma activation between third and first frequent tone in the 100–150？ms time period in the three groups. d Total inter-trial coherence responses collapsed across all infants and all Standard trials. The 100？180？ms time-window and 10–20？Hz band was chosen as the area of interest for group comparisons. e Inter-trial coherence values for all standards collapsed together in the high-risk infant siblings from right tempo-parietal scalp region. LR group included for reference. Note. Error bars depict standard error of the mean for each group respectively. LR low risk. * Denotes signficance level (i.e. p？<？.05