Some authors have suggested that cortical hyper-excitability in ASD may be restricted to/more pronounced in, primary sensory areas (e.g., Rubenstein and Merzenich, 2003; Mottron et al., 2006). Therefore in order to evaluate these results in light of current theories it is necessary to consider where the neural generators of the P1 deflection analyzed here might be. The location of the electrodes selected from the CSD data, and the estimated location of the equivalent current dipole of the ICs suggests that the P1 analyzed here is generated in extra-striate cortex. This is commensurate with a number of papers that have localized the neural generators of the P1 deflection to the extra-striate cortex (e.g., Di Russo et al., 2001; Ales et al., 2010). Therefore, these data provide evidence for variability in extra-striate cortex rather than primary visual cortex. As noted in the 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,
