The fronto-parietal network and top-down modulation of perceptual grouping.

Journal article

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.

Authors: Han, S; Humphreys, G

• Publication status: Published
• Journal: Neurocase
• Volume: 13
• Issue: 4
• Pages: 278-289
• Publication date: 2007-08-01
• DOI: 10.1080/13554790701649930
• EISSN: 1465-3656
• ISSN: 1355-4794
• Language: English
• Keywords: Parietal Lobe; Frontal Lobe; Reaction Time; Electroencephalography; Nerve Net; Time Factors; Aged; Middle Aged; Brain Mapping; Brain Injuries; Humans; Female; Photic Stimulation; Evoked Potentials, Visual; Functional Laterality; Male; Pattern Recognition, Visual