Cited by 1,755Visual perception and processing mechanismsNeural dynamics and brain functionMotor Control and Adaptation

Neural Basis of a Perceptual Decision in the Parietal Cortex (Area LIP) of the Rhesus Monkey

Shadlen, Michael N., Newsome, William T.·2001·Journal of Neurophysiology

Abstract

We recorded the activity of single neurons in the posterior parietal cortex (area LIP) of two rhesus monkeys while they discriminated the direction of motion in random-dot visual stimuli. The visual task was similar to a motion discrimination task that has been used in previous investigations of motion-sensitive regions of the extrastriate cortex. The monkeys were trained to decide whether the direction of motion was toward one of two choice targets that appeared on either side of the random-dot stimulus. At the end of the trial, the monkeys reported their direction judgment by making an eye movement to the appropriate target. We studied neurons in LIP that exhibited spatially selective persistent activity during delayed saccadic eye movement tasks. These neurons are thought to carry high-level signals appropriate for identifying salient visual targets and for guiding saccadic eye movements. We arranged the motion discrimination task so that one of the choice targets was in the LIP neuron's response field (RF) while the other target was positioned well away from the RF. During motion viewing, neurons in LIP altered their firing rate in a manner that predicted the saccadic eye movement that the monkey would make at the end of the trial. The activity thus predicted the monkey's judgment of motion direction. This predictive activity began early in the motion-viewing period and became increasingly reliable as the monkey viewed the random-dot motion. The neural activity predicted the monkey's direction judgment on both easy and difficult trials (strong and weak motion), whether or not the judgment was correct. In addition, the timing and magnitude of the response was affected by the strength of the motion signal in the stimulus. When the direction of motion was toward the RF, stronger motion led to larger neural responses earlier in the motion-viewing period. When motion was away from the RF, stronger motion led to greater suppression of ongoing activity. Thus the activity of single neurons in area LIP reflects both the direction of an impending gaze shift and the quality of the sensory information that instructs such a response. The time course of the neural response suggests that LIP accumulates sensory signals relevant to the selection of a target for an eye movement.

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Crossref · 10.1152/jn.2001.86.4.1916

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Authors
Shadlen, M. N., & Newsome, W. T.
Affiliations
Howard Hughes Medical Institute (US)
Venue
Journal of Neurophysiology
Published
2001-10-01
Volume
86
Issue
4
Pages
1916-1936
ISSN
  • 0022-3077 (ISSN-L)
  • 1522-1598
OpenAlex
W2122066429
Cited by
1,755
References
95
Citations by year
2026: 61 · 2025: 77 · 2024: 71 · 2023: 61 · 2022: 90 · 2021: 74 · 2020: 74 · 2019: 85 · 2018: 76 · 2017: 81 · 2016: 77 · 2015: 86 · 2014: 99 · 2013: 93 · 2012: 87
FWCI
15.72
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Neurophysiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Eye Institute (EY11378, EY 05603, R01EY011378)
  • National Center for Research Resources (RR00166, P51RR000166)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Motor Control and Adaptation
Keywords
lateral intraparietal area, posterior parietal cortex, perceptual decision making, motion direction discrimination, random dot motion, saccades, persistent activity, single-unit activity, response fields, gaze shifts, rhesus monkeys
MeSH terms
Action Potentials, Animals, Discrimination, Psychological, Electrophysiology, Female, Macaca mulatta, Male, Motion Perception, Motor Neurons, Neurons, Afferent, Parietal Lobe, Photic Stimulation, Psychophysics, Saccades, Linear Models

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