The response-locked EEG components revealed an early negative correlate in superior frontal gyrus, but most of the significant BOLD activations appeared in windows close to the RT. These included negative activations in LOC, middle temporal and frontal gyri, and precentral and postcentral gyri. We saw positive activations in cerebellum, posterior cingulate, and precuneus immediately following response time. Later response-locked components revealed additional negative activations in postcentral and precentral gyri. Supra-threshold negative and positive activations also appeared in white matter for our response-locked analysis.
