Figure 4.

Elimination of eye‐movement artifacts from ERP data. (A) Scalp topography and five consecutive 1‐sec target response epochs showing the time course of activation of an ICA component accounting for blink artifacts. This component was separated by ICA from 321 target‐response trials recorded from an adult autistic subject in the visual selective attention experiment. (B) The scalp topography of a second eye‐movement component and its average activation time course in response to target stimuli presented at the five different attended locations. (C) Averages of (N = 231) relatively uncontaminated (solid traces) and (N = 90) heavily contaminated (faint traces) single‐trial target response epochs from a normal control subject. (D) Averages of ICA‐corrected ERPs for the same two trial subgroups overplotted on the average of uncorrected uncontaminated trials.