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Task structure. Each trial began with an auditory preparatory cue indicating which of two peripheral locations subjects should covertly attend. After a variable SOA, Gabor patches appeared briefly at both locations, coincident with an auditory cue indicating the target stimulus. Subjects reported the orientation of the Gabor at the target location with a button press. This study focused on BOLD activity after the preparatory cue but before the onset of the visual targets.
