title: Identification of event-related potentials elicited by conceptual mismatch between expectations and self-chosen TV images.
abstract: When a voluntary action is followed by an unexpected stimulus, a late positive potential (LPP) with a posterior scalp distribution is elicited in a latency range of 500-700 ms. In the present study, we examined what type of mismatch between expectations and action outcomes was reflected by the LPP. Twelve student volunteers participated in a task simulating choice of TV programs. After choosing one of three options displayed as a cue stimulus, they viewed a second stimulus (still TV image). To manipulate the type of expectation, three kinds of cue conditions were used: thumbnail image condition (three small TV images), category label condition (three words), and no cue condition (three question marks). Over trials, the second stimulus either matched (p = .80) or mismatched (p = .20) the chosen option. As compared to matched TV images, mismatched TV images elicited a larger LPP (500-700 ms) in the thumbnail image and category label conditions. In addition, a larger centroparietal P3 (400-450 ms) was elicited to mismatched TV images in the thumbnail image condition alone. LPP reflects a conceptual mismatch between a category-based expectation and an ensuing action outcome, whereas P3 reflects a perceptual mismatch between an image-based expectation and an action outcome.
authors.affiliation: Advanced Technology Research Laboratory, Panasonic Corporation, 3-4 Hikaridai, Seika-cho, Soraku-gun, Kyoto, 619-0237, Japan. adachi.shinobu@jp.panasonic.com
authors.forename: Shinobu
authors.initials: S
authors.lastname: Adachi
authors.forename: Koji
authors.initials: K
authors.lastname: Morikawa
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Nittono
mesh_terms: D000328:Adult; D001288:Attention / Q000502:physiology*; D002540:Cerebral Cortex / Q000502:physiology*; D002755:Choice Behavior / Q000502:physiology; D005071:Evoked Potentials / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D010775:Photic Stimulation; D013690:Television