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Neural substrates for visual perceptual grouping in humans
Author(s) -
Han Shihui,
Song Yan,
Ding Yulong,
Yund E. William,
Woods David L.
Publication year - 2001
Publication title -
psychophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.661
H-Index - 156
eISSN - 1469-8986
pISSN - 0048-5772
DOI - 10.1111/1469-8986.3860926
Subject(s) - psychology , negativity effect , event related potential , gestalt psychology , perception , stimulus (psychology) , neuroscience , luminance , pattern recognition (psychology) , communication , electroencephalography , cognitive psychology , artificial intelligence , computer science
Two experiments investigated the neural mechanisms of Gestalt grouping by recording high‐density event‐related brain potentials (ERPs) during discrimination tasks. In Experiment 1, stimulus arrays contained luminance‐defined local elements that were either evenly spaced or grouped into columns or rows based on either proximity or similarity of shape. Proximity grouping was indexed by a short‐latency positivity (110–120 ms) over the medial occipital cortex and a subsequent right occipitoparietal negativity. Grouping by similarity was reflected only in a long‐latency occipitotemporal negativity. In Experiment 2, proximity grouping was examined when local elements were defined by motion cues, and was again associated with a medial occipital positivity. However, the subsequent long‐latency negativity was now enhanced over the left posterior areas. The implications of these results to the neural substrates subserving different grouping processes are discussed.