P1 was extracted from trials in which the eliciting stimulus was a Gabor patch with a spatial frequency content of 8 cycles/degree and the behavioral data were derived from trials in which the eliciting stimulus was a zebra), therefore it is not the case that specific trial-by-trial variations in ERP amplitude are driving the variability in response time, rather it appears as though a common mechanism may underpin both behavioral variability and ERP amplitude variability.
