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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 publication




Journal article



Publication Date





278 - 289


Aged, Brain Injuries, Brain Mapping, Electroencephalography, Evoked Potentials, Visual, Female, Frontal Lobe, Functional Laterality, Humans, Male, Middle Aged, Nerve Net, Parietal Lobe, Pattern Recognition, Visual, Photic Stimulation, Reaction Time, Time Factors