Neural representation of motion-in-depth in area MT

Neural processing of 2D visual motion has been studied extensively, but relatively little is known about how visual cortical neurons represent visual motion trajectories that include a component toward or away from the observer (motion in depth). Psychophysical studies have demonstrated that humans...

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Bibliographic Details
Published in:The Journal of neuroscience 2014-11, Vol.34 (47), p.15508-15521
Main Authors: Sanada, Takahisa M, DeAngelis, Gregory C
Format: Article
Language:English
Subjects:
Animals
Cues
Depth Perception - physiology
Functional Laterality - physiology
Macaca
Macaca mulatta
Male
Motion Perception - physiology
Vision, Binocular - physiology
Vision, Monocular - physiology
Visual Cortex - physiology
Visual Perception - physiology
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Summary:Neural processing of 2D visual motion has been studied extensively, but relatively little is known about how visual cortical neurons represent visual motion trajectories that include a component toward or away from the observer (motion in depth). Psychophysical studies have demonstrated that humans perceive motion in depth based on both changes in binocular disparity over time (CD cue) and interocular velocity differences (IOVD cue). However, evidence for neurons that represent motion in depth has been limited, especially in primates, and it is unknown whether such neurons make use of CD or IOVD cues. We show that approximately one-half of neurons in macaque area MT are selective for the direction of motion in depth, and that this selectivity is driven primarily by IOVD cues, with a small contribution from the CD cue. Our results establish that area MT, a central hub of the primate visual motion processing system, contains a 3D representation of visual motion.
ISSN:0270-6474
1529-2401
DOI:10.1523/jneurosci.1072-14.2014