The Fronto-Parietal Network and Top-Down Modulation of Perceptual Grouping

S Han, Glyn Humphreys

Research output: Contribution to journalArticle

11 Citations (Scopus)


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 languageEnglish
Pages (from-to)278-289
Number of pages12
Issue number4
Publication statusPublished - 1 Aug 2007


  • proximity
  • collinearity
  • fronto-parietal lesion
  • perceptual grouping
  • ERP


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