NDLI: A Neural Representation of Depth from Motion Parallax in Macaque Visual Cortex

Content Provider	PubMed Central
Author	Nadler, Jacob W. Angelaki, Dora E. Deangelis, Gregory C.
Abstract	Perception of depth is a fundamental challenge for the visual system, particularly for observers moving through their environment. The brain makes use of multiple visual cues to reconstruct the three-dimensional structure of a scene. One potent cue, motion parallax, frequently arises during translation of the observer because the images of objects at different distances move across the retina with different velocities. Human psychophysical studies have demonstrated that motion parallax can be a powerful depth cue1-5, and motion parallax appears to be heavily exploited by animal species that lack highly developed binocular vision6-8. However, little is known about the neural mechanisms that underlie this capacity. We used a virtual-reality system to translate macaque monkeys while they viewed motion parallax displays that simulated objects at different depths. We show that many neurons in the middle temporal (MT) area signal the sign of depth (i.e., near vs. far) from motion parallax in the absence of other depth cues. To achieve this, neurons must combine visual motion with extra-retinal (non-visual) signals related to the animal's movement. Our findings suggest a new neural substrate for depth perception, and demonstrate a robust interaction of visual and non-visual cues in area MT. Combined with previous studies that implicate area MT in depth perception based on binocular disparities9-12, our results suggest that MT contains a more general representation of three dimensional space that leverages multiple cues.
Related Links	http://dx.doi.org/10.1038/nature06814
Ending Page	645
Page Count	4
Starting Page	642
File Format	PDF
ISSN	00280836
e-ISSN	14764687
Journal	Nature
Issue Number	7187
Volume Number	452
Language	English
Publisher Date	2008-04-03
Access Restriction	Open
Subject Keyword	General Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
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9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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