Cited by 42Visual perception and processing mechanismsMotor Control and AdaptationMultisensory perception and integration

Directional Anisotropies Reveal a Functional Segregation of Visual Motion Processing for Perception and Action

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Churchland, Anne K., Gardner, Justin L., Chou, I-han, Priebe, Nicholas J., Lisberger, Stephen G.·2003·Neuron

Abstract

Human exhibits an anisotropy in direction perception: discrimination is superior when motion is around horizontal or vertical rather than diagonal axes. In contrast to the consistent directional anisotropy in perception, we found only small idiosyncratic anisotropies in smooth pursuit eye movements, a motor action requiring accurate discrimination of visual motion direction. Both pursuit and perceptual direction discrimination rely on signals from the middle temporal visual area (MT), yet analysis of multiple measures of MT neuronal responses in the macaque failed to provide evidence of a directional anisotropy. We conclude that MT represents different motion directions uniformly, and subsequent processing creates a directional anisotropy in pathways unique to perception. Our data support the hypothesis that, at least for visual motion, perception and action are guided by inputs from separate sensory streams. The directional anisotropy of perception appears to originate after the two streams have segregated and downstream from area MT.

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  • The 90° separation in a 2-choice task increased difficulty slightly.

    “Although this angle remains large compared to fine discriminations that humans and monkeys can make 22–24, it did increase difficulty slightly, as shown by 90° separation in a 2-choice task.”

    From Decision-making with multiple alternatives (2008) · cites this paper as [24]

  • The experiment is not definitive about how the computation generalizes to more directions and choices, in part because the angle between alternatives is large compared to the range of angles that primates can discriminate.

    “Our experiment is not definitive here, in part because the angle between alternatives is large compared to the range of angles that primates can discriminate 22–24.”

    From Decision-making with multiple alternatives (2008) · cites this paper as [24]

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Authors
Churchland, A. K., Gardner, J. L., Chou, I.-H., Priebe, N. J., & Lisberger, S. G.
Affiliations
Howard Hughes Medical Institute (US)
Corresponding author
Churchland, Anne K.
Venue
Neuron
Publisher
Elsevier BV
Published
2003-03
Volume
37
Issue
6
Pages
1001-1011
ISSN
0896-6273 (ISSN-L)
OpenAlex
W2117529001
Cited by
42
References
46
Citations by year
2026: 1 · 2025: 1 · 2024: 1 · 2023: 1 · 2020: 1 · 2019: 1 · 2018: 1 · 2017: 1 · 2016: 1 · 2015: 4 · 2014: 4 · 2013: 3 · 2012: 2
FWCI
1.30
Type
journal article
Language
en
Open access
Locations
  • Neuron (publishedVersion)
  • PubMed (publishedVersion)
  • Cold Spring Harbor Laboratory Institutional Repository (Cold Spring Harbor Laboratory) (acceptedVersion)
Funders
Howard Hughes Medical Institute
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Motor Control and Adaptation
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Multisensory perception and integration
Keywords
directional anisotropy, smooth pursuit eye movements, middle temporal area, dorsal and ventral visual streams, macaque, motion perception
MeSH terms
Animals, Discrimination, Psychological, Eye Movements, Humans, Macaca, Motion, Neurons, Temporal Lobe, Visual Perception, Anisotropy

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