Evidence for a new late positive ERP component in an attended novelty oddball task |
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| Authors: | Craig G. McDonald Frances H. Gabbay Jeremy C. Rietschel Connie C. Duncan |
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| Affiliation: | 1. Department of Psychology, George Mason University, Fairfax, Virginia, USA;2. Clinical Psychophysiology and Psychopharmacology Laboratory, Department of Psychiatry, Uniformed Services University of the Health Sciences, Bethesda, Maryland, USA;3. Neuroscience and Cognitive Science Program, Department of Kinesiology, University of Maryland, College Park, Maryland, USA |
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| Abstract: | In attended novelty oddball tasks, rare nontarget stimuli can elicit two late positive ERP components: P3a and P300. In passive oddball tasks, P300 is not elicited by these stimuli. In passive tasks, however, P3a is accompanied by another positive component, termed eP3a, which may have evaded detection in attended oddball tasks because of its spatiotemporal overlap with P300. To address this, temporal‐spatial principal components analysis was used to quantify ERPs recorded in attended three‐tone and novelty oddball tasks. As expected, novel stimuli elicited both P3a and P300. The analysis also identified a third component, evident in novelty ERPs as an inflection on the leading edge of P3a. This component has the same antecedent conditions as P3a, but is earlier and more centrally distributed. Its spatiotemporal characteristics suggest that it may be the eP3a component recently described in passive oddball tasks. |
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| Keywords: | Event‐related potentials eP3a P3a P300 PCA Information processing |
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