Introduction the earlier C1 deflection would be a more appropriate deflection with which to investigate variability in primary visual cortex, however this was not analyzed here as a number of participants with ASD failed to show a clear C1 deflection, either in the (averaged) ERP or in the single-trials. The specific reason for this is unclear, but is being addressed by on-going studies by our research group. Therefore, although the P1 deflection reported here does not tap the earliest stage visual processing, it was the most robust early deflection in the data, making it the best available candidate to investigate increased noise in the visual cortex in ASD. Future studies are required to establish whether areas of primary sensory cortex, generating earlier ERP deflections, show similar, or possibly greater, levels of variability in participants with ASD.
