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Hokkaido University Collection of Scholarly and Academic Papers >
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Are objects the same as groups? ERP correlates of spatial attentional guidance by irrelevant feature similarity
| Title: | Are objects the same as groups? ERP correlates of spatial attentional guidance by irrelevant feature similarity |
| Authors: | Kasai, Tetsuko Browse this author | | Moriya, Hiroki Browse this author | | Hirano, Shingo Browse this author |
| Keywords: | Attention | | Object | | Grouping | | Similarity | | Event-related potential | | N1 |
| Issue Date: | 5-Jul-2011 |
| Publisher: | Elsevier B.V. |
| Journal Title: | Brain Research |
| Volume: | 1399 |
| Start Page: | 49 |
| End Page: | 58 |
| Publisher DOI: | 10.1016/j.brainres.2011.05.016 |
| PMID: | 21652032 |
| Abstract: | It has been proposed that the most fundamental units of attentional selection are "objects" that are grouped according to Gestalt factors such as similarity or connectedness. Previous studies using event-related potentials (ERPs) have shown that object-based attention is associated with modulations of the visual-evoked N1 component, which reflects an early cortical mechanism that is shared with spatial attention. However, these studies only examined the case of perceptually continuous objects. The present study examined the case of separate objects that are grouped according to feature similarity (color, shape) by indexing lateralized potentials at posterior sites in a sustained-attention task that involved bilateral stimulus arrays. A behavioral object effect was found only for task-relevant shape similarity. Electrophysiological results indicated that attention was guided to the task-irrelevant side of the visual field due to achromatic-color similarity in N1 (155-205 ms post-stimulus) and early N2 (210-260 ms) and due to shape similarity in early N2 and late N2 (280-400 ms) latency ranges. These results are discussed in terms of selection mechanisms and object/group representations. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/46887 |
| 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: 河西 哲子
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