Joseph Brooks j.l.brooks@keele.ac.uk
Cue Competition Affects Temporal Dynamics of Edge-assignment in Human Visual Cortex
Brooks
Authors
Abstract
Edge-assignment determines the perception of relative depth across an edge and the shape of the closer side. Many cues determine edge-assignment, but relatively little is known about the neural mechanisms involved in combining these cues. Here, we manipulated extremal edge and attention cues to bias edge-assignment such that these two cues either cooperated or competed. To index their neural representations, we flickered figure and ground regions at different frequencies and measured the corresponding steady-state visual-evoked potentials (SSVEPs). Figural regions had stronger SSVEP responses than ground regions, independent of whether they were attended or unattended. In addition, competition and cooperation between the two edge-assignment cues significantly affected the temporal dynamics of edge-assignment processes. The figural SSVEP response peaked earlier when the cues causing it cooperated than when they competed, but sustained edge-assignment effects were equivalent for cooperating and competing cues, consistent with a winner-take-all outcome. These results provide physiological evidence that figure–ground organization involves competitive processes that can affect the latency of figural assignment.
Acceptance Date | Dec 9, 2011 |
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Publication Date | Dec 9, 2011 |
Journal | Journal of Cognitive Neuroscience |
Print ISSN | 0898-929X |
Publisher | Massachusetts Institute of Technology Press |
Pages | 631 - 644 |
DOI | https://doi.org/10.1162/jocn.2010.21433 |
Publisher URL | https://doi.org/10.1162/jocn.2010.21433 |
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