Abstract
We examined the role of the fronto-parietal cortex in top-down modulation of perceptual grouping by proximity, collinearity, and similarity, by recording event related brain potentials from two patients with fronto-parietal lesions and eight controls. We found that grouping by proximity and collinearity in the controls was indexed by short-latency activities over the medial occipital cortex and long-latency activities over the occipito-parietal areas. For the patients, however, both the short- and long-latency activities were eliminated or weakened. The results suggest that the fronto-parietal network is involved in facilitation of both the early and late grouping processes in the human brain.
Original language | English |
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Pages (from-to) | 278-289 |
Number of pages | 12 |
Journal | Neurocase |
Volume | 13 |
Issue number | 4 |
DOIs | |
Publication status | Published - 1 Aug 2007 |
Keywords
- proximity
- collinearity
- fronto-parietal lesion
- perceptual grouping
- ERP