The result in this paper present a re-analysis of data collected for a previous study (Milne et al., 2009), in which the visual evoked response in children/adolescents with and without ASD was investigated. Previously, we compared amplitude and latency indices of the visual evoked potential (VEP, e.g., the C1 and P1 deflections), and changes in α- and γ-band power associated with presentation of Gabor patches at a range of different spatial frequencies. We found that the time at which spectral power increase following stimulus onset was reduced in the participants with ASD (see also Isler et al., 2010), and that the extent to which the spatial frequency content of the stimuli modulated α- and γ-band power was less in the participants with ASD (see also Jemel et al., 2010). Here, I now investigate intra-participant EEG variability: single-trial variability across the time-course is analyzed by comparing point-by-point amplitude variability across trials, and also by computing the degree of inter-trial phase consistency across the time-course. In addition, variability of P1 amplitude, i.e., the consistency of P1 magnitude, and variability of P1 latency,
