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Cited by 941Visual perception and processing mechanismsFace Recognition and PerceptionMultisensory perception and integration

Improvement in visual sensitivity by changes in local context: parallel studies in human observers and in V1 of alert monkeys

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Kapadia, Mitesh K., Ito, Minami, Gilbert, Charles D., Westheimer, Gerald·1995·Neuron
DOI 10.1016/0896-6273(95)90175-2
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Abstract

To explore the role of primary visual cortex in contour integration, we measured the contextual sensitivity of human contrast thresholds and of superficial layer complex cells in monkey V1. An observer's contrast detection was 40% improved by a second suprathreshold bar; the effect was decreased as the two bars were separated along their axis of orientation, were displaced from colinearity, and had their relative orientation changed. Recordings from V1 showed that 42% of complex cells demonstrated facilitation for a second bar outside their classical receptive fields with a similar dependency on relative location and orientation. Both effects were eliminated by an orthogonal line between the two iso-oriented lines. Multiple randomly placed and oriented lines in the receptive field surround often caused a reduction in a cell's response to an optimally oriented stimulus, but this inhibition could be eliminated by changing the orientation of a few of these elements to colinearity with the centrally located target.

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Crossref · 10.1016/0896-6273(95)90175-2

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52 of 52 references verified0 citation errors · 0 not checkable

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  • Kapadia et al. (1995) showed that the neural response to a line segment increases when collinear line segments are presented outside of the classic receptive field.

    “On the contrary, Kapadia et al. (1995) showed that the neural response to a line segment increases when collinear line segments are presented outside of the classic receptive field.”

    From Is predictive coding theory articulated enough to be testable? (2015) · cites this paper as Kapadia et al. (1995)

  • Contour integration deficits in schizophrenia are thought to result from decreased NMDA-modulated lateral excitation among the spatial filters signaling the elements and the consequent reduction in synchronization of this neural activity.

    “This is thought to result from decreased NMDA-modulated lateral excitation among the spatial filters signaling these elements and the consequent reduction in synchronization of this neural activity ([68]; see also for reviews [69,70]).”

    From Visual perception and its impairment in schizophrenia (2008) · cites this paper as [68]

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Authors
Kapadia, M. K., Ito, M., Gilbert, C. D., & Westheimer, G.
Affiliations
  • Rockefeller University (US)
  • University of California, Berkeley (US)
ORCID
Venue
Neuron
Publisher
Elsevier BV
Published
1995-10
Volume
15
Issue
4
Pages
843-856
ISSN
0896-6273 (ISSN-L)
DOI
10.1016/0896-6273(95)90175-2
OpenAlex
W2029346512
Cited by
941
References
52
Citations by year
2026: 7 · 2025: 17 · 2024: 24 · 2023: 31 · 2022: 11 · 2021: 9 · 2020: 15 · 2019: 8 · 2018: 19 · 2017: 21 · 2016: 19 · 2015: 37 · 2014: 31 · 2013: 29 · 2012: 28
FWCI
13.92
Type
journal article
Language
en
Open access
Licence
Locations
  • Neuron (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Eye Institute (R01EY007968, EY07968, EY-00220)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Face Recognition and Perception
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Multisensory perception and integration
Keywords
contour integration, context sensitivity, primary visual cortex, complex cells, contrast threshold, receptive field surround, orientation, colinearity, lateral inhibition
MeSH terms
Animals, Humans, Macaca mulatta, Male, Neurons, Orientation, Psychophysics, Visual Cortex, Visual Fields, Visual Perception, Contrast Sensitivity

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