The Begleiter rotated heads task (Begleiter et al., 1984) served to elicit event-related potentials (ERPs). Subjects viewed 240 stimuli presented one at a time on a computer display in a Bernoulli sequence. A 500-ms baseline interval preceded stimulus onset. Stimulus duration was 100 ms. Responses were monitored during a response window of 1.5 s and a random intertrial interval drawn from a uniform distribution of 1–2 s. Superior views of stylized “heads” consisting of an oval, the nose, and one ear served as target stimuli (n = 80), with the head rotated 180° on half the trials. The subject’s task was to press a button on either the left or right arm of their chair to indicate whether they had viewed a left- or right-ear head. Stimuli for the remaining trials consisted of plain ovals (n = 160), which required no response.
