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Stimulus context determines whether non-target stimuli are processed as task-relevant or distractor information
| Title: | Stimulus context determines whether non-target stimuli are processed as task-relevant or distractor information |
| Authors: | Sawaki, Risa Browse this author | | Katayama, Jun'ichi Browse this author |
| Keywords: | Event-related potential | | Stimulus context | | P3a | | P3b | | Non-target | | Three-stimulus oddball paradigm |
| Issue Date: | Nov-2006 |
| Publisher: | International Federation of Clinical Neurophysiology Published by Elsevier Ireland Ltd |
| Journal Title: | Clinical Neurophysiology |
| Volume: | 117 |
| Issue: | 11 |
| Start Page: | 2532 |
| End Page: | 2539 |
| Publisher DOI: | 10.1016/j.clinph.2006.06.755 |
| PMID: | 17005448 |
| Abstract: | Objective:The P300 event-related brain potential (ERP) was elicited using a visual three-stimulus oddball paradigm (standard 0.70, target 0.15, non-target 0.15) to examine how target/standard stimulus context affects non-target processing.
Methods:Target/standard discrimination difficulty (easy or difficult) and non-target /target similarity (similar or dissimilar) were manipulated orthogonally. Participants (N = 13) were instructed to respond to each infrequent target stimulus by pressing a button. Results:Target stimuli in all task conditions elicited P3b, which was affected only by the difficulty of target/standard discrimination. When target/standard discrimination was easy, the amplitude of non-target P3 was larger for similar than for dissimilar non-target. In contrast, when target/standard discrimination was difficult, non-target stimuli elicited P3a, the amplitude of which was larger for dissimilar than for similar non-target. Thus, the P300 component for non-target stimuli and the pattern of the effect of target similarity on each P300 component varied as a function of the target/standard stimulus context. Conclusions:The target/standard stimulus context influences the attentional set for stimulus processing such that it determines whether non-target stimuli are processed as task-relevant or distractor information. Significance:The present results are important for understanding the mechanism of cognitive modification in non-target processing. |
| Relation: | http://www.sciencedirect.com/science/journal/13882457 |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/15811 |
| Appears in Collections: | 教育学院・教育学研究院 (Graduate School of Education / Faculty of Education) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 片山 順一
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