Group (ASD vs. TD) average of signal power of HbO2 and Hb for each channel. For all channels except for channel 12 and 20 of Hb, ASD show significantly larger than TD in the signal power (p<0.05 after FDR correction). The error bar is the standard error of mean. The top 4 channels with the smallest p value are 6, 8, 3, 22 for HbO2, and 8, 6, 19, 14 for Hb.