Effects of self-evaluation on the P300 event-related potential |
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Authors: | Alexander Joel E Alexander Ronald G Crowson Ben Machan Kelly Hall Carrie-Ann Lockwood Denesa Godinez Detre |
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Affiliation: | Psychology Division, Western Oregon University, Monmouth, OR 97361, USA. alexanj@wou.edu |
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Abstract: | The effects of self evaluation on the P300 event-related potential (ERP) were explored with 56 participants (16 men, 40 women; M age = 23.4 yr., SD = 1.2) across three conditions. The conditions included (1) a standard ERP auditory oddball discrimination between a random target (15% occurrence) and standard stimuli (85% occurrence), (2) the oddball task followed by the additional cognitive task of maintaining a mental count of the target tones, and (3) the oddball task followed by the additional cognitive task of self-evaluating whether they felt surprised by the current occurrence of the target tone. The added cognitive requirements for Conditions 2 and 3 required the subjects to maintain a cognitive readiness for the secondary stimulus-related task during their sensory discrimination response for the standard oddball task. During the self-evaluation condition, the P300 amplitude was significantly larger across all recording locations than the regular oddball condition and the cognitive count condition. |
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