Cited by 353Visual perception and processing mechanismsVisual Attention and Saliency DetectionMultisensory perception and integration

Effects of Spatial Attention on Contrast Response Functions in Macaque Area V4

Williford, Tori, Maunsell, John H. R.·2006·Journal of Neurophysiology

Abstract

Previous single-unit studies of visual cortex have reported that spatial attention modulates responses to different orientations and directions proportionally, such that it does not change the width of tuning functions for these properties. Other studies have suggested that spatial attention causes a leftward shift in contrast response functions, such that its effects on responses to stimuli of different contrasts are not proportional. We have further explored the effects of attention on stimulus-response functions by measuring the responses of 131 individual V4 neurons in two monkeys while they did a task that controlled their spatial attention. Each neuron was tested with a set of stimuli that spanned complete ranges of orientation and contrast during different states of attention. Consistent with earlier reports, attention scaled responses to preferred and nonpreferred orientations proportionally. However, we did not find compelling evidence that the effects were best described by a leftward shift of the contrast response function. The modulation of neuronal responses by attention was well described by either a leftward shift or proportional scaling of the contrast response function. Consideration of differences in experimental design and analysis that may have contributed to this discrepancy suggests that it was premature to exclude a proportional scaling of responses to different contrasts by attention in favor of a leftward shift of contrast response functions. The current results reopen the possibility that the effects of attention on stimulus-response functions are well described by a single proportional increase in a neuron's response to all stimuli.

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Crossref · 10.1152/jn.01207.2005

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  • In non-human primate visual system, visual spatial attention within the receptive field of a recorded neuron enhances both contrast gain and response gain.

    “Attentional modulation of neural gain has been particularly well studied in the non-human primate visual system1,42,43, in which visual spatial attention within the receptive field of a recorded neuron enhances both contrast gain (that is, scaling of that neuron’s stimulus-response relationship along the contrast axis)43 and response gain (that is, multiplicative transformation of responses to all”

    From Mechanisms underlying gain modulation in the cortex (2020) · cites this paper as [48]

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Authors
Williford, T., & Maunsell, J. H. R.
Affiliations
Howard Hughes Medical Institute (US)
Venue
Journal of Neurophysiology
Published
2006-07
Volume
96
Issue
1
Pages
40-54
ISSN
  • 0022-3077 (ISSN-L)
  • 1522-1598
OpenAlex
W2092212529
Cited by
353
References
49
Citations by year
2026: 5 · 2025: 12 · 2024: 17 · 2023: 14 · 2022: 10 · 2021: 22 · 2020: 9 · 2019: 16 · 2018: 11 · 2017: 15 · 2016: 18 · 2015: 16 · 2014: 28 · 2013: 22 · 2012: 18
FWCI
13.77
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Neurophysiology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
  • Physical Sciences › Computer Science › Computer Vision and Pattern Recognition › Visual Attention and Saliency Detection
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Multisensory perception and integration
Keywords
spatial attention, contrast response function, area V4, macaque visual cortex, orientation tuning, proportional scaling, leftward shift, single-unit responses, stimulus-response function, attentional modulation
MeSH terms
Animals, Attention, Evoked Potentials, Visual, Macaca mulatta, Male, Neurons, Afferent, Orientation, Pattern Recognition, Visual, Psychophysiology, Space Perception, Visual Cortex, Contrast Sensitivity

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