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Cited by 310Visual perception and processing mechanismsFace Recognition and PerceptionMotor Control and Adaptation

Physiological Correlates of Perceptual Learning in Monkey V1 and V2

Ghose, Geoffrey M., Yang, Tianming, Maunsell, John H. R.·2002·Journal of Neurophysiology
DOI 10.1152/jn.00690.2001
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Abstract

Performance in visual discrimination tasks improves with practice. Although the psychophysical parameters of these improvements have suggested the involvement of early areas in visual cortex, there has been little direct study of the physiological correlates of such perceptual learning at the level of individual neurons. To examine how neuronal response properties in the early visual system may change with practice, we trained monkeys for more than 6 mo in an orientation discrimination task in which behaviorally relevant stimuli were restricted to a particular retinal location and oriented around a specific orientation. During training the monkeys' discrimination thresholds gradually improved to much better than those of naive monkeys or humans. Although this improvement was specific to the trained orientation, it showed little retinotopic specificity. The receptive field properties of single neurons from regions representing the trained location and a location in the opposite visual hemifield were measured in V1 and V2. In most respects the receptive field properties in the representations of the trained and untrained regions were indistinguishable. However, in the regions of V1 and V2 representing the trained location, there were slightly fewer neurons whose optimal orientation was near the trained orientation. This resulted in a small but significant decrease in the V1 population response to the trained orientation at the trained location. Consequently, the observed neuronal populations did not exhibit any orientation-specific biases sufficient to explain the orientation specificity of the behavioral improvement. Pooling models suggest that the behavioral improvement was accomplished with a task-dependent and orientation-selective pooling of unaltered signals from early visual neurons. These data suggest that, even for training with stimuli suited to the selectivities found in early areas of visual cortex, behavioral improvements can occur in the absence of pronounced changes in the physiology of those areas.

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Authors
Ghose, G. M., Yang, T., & Maunsell, J. H. R.
Affiliations
Howard Hughes Medical Institute (US)
ORCID
Venue
Journal of Neurophysiology
Publisher
American Physiological Society
Published
2002-04-01
Volume
87
Issue
4
Pages
1867-1888
ISSN
  • 0022-3077 (ISSN-L)
  • 1522-1598
DOI
10.1152/jn.00690.2001
OpenAlex
W2166149038
Cited by
310
References
130
Citations by year
2026: 3 · 2025: 7 · 2024: 14 · 2023: 8 · 2022: 8 · 2021: 9 · 2020: 9 · 2019: 9 · 2018: 15 · 2017: 15 · 2016: 8 · 2015: 13 · 2014: 18 · 2013: 12 · 2012: 22
FWCI
6.53
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Neurophysiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Eye Institute (EY05911, R01EY005911)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Face Recognition and Perception
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Motor Control and Adaptation
Keywords
perceptual learning, orientation discrimination, primary visual cortex, secondary visual cortex, receptive field properties, orientation selectivity, visual cortex plasticity, single-unit recording, monkey visual system
MeSH terms
Animals, Behavior, Animal, Discrimination, Psychological, Electrophysiology, Learning, Macaca mulatta, Models, Neurological, Neurons, Orientation, Retina, Visual Cortex, Visual Perception

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