Document Detail

Convergent evidence for the visual analysis of optic flow through anisotropic attenuation of high spatial frequencies.
MedLine Citation:
PMID:  15330709     Owner:  NLM     Status:  MEDLINE    
Photoreceptors strongly attenuate high temporal frequencies. Hence when an image moves, high spatial frequency components are lost if their direction of modulation coincides with the direction of movement, but not if it is orthogonal. The power spectra of natural images are remarkably consistent in having a 1/f 2 falloff in power in all directions. For moving images, the spatial power spectra will be distorted by becoming steeper in the direction corresponding to modulation in the direction of motion, and the contours of equal power will tend to become elliptical. This study demonstrates that the mammalian visual system is specifically sensitive to such anisotropic changes of the local power spectrum, and it is suggested that these distortions are used to determine patterns of optic flow. Convergent evidence from work on Glass figures, motion streaks, and sensitivity to non-Cartesian gratings is called on in support of this interpretation, which has been foreshadowed in several recent publications.
Horace B Barlow; Bruno A Olshausen
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.     Date:  2004-05-18
Journal Detail:
Title:  Journal of vision     Volume:  4     ISSN:  1534-7362     ISO Abbreviation:  J Vis     Publication Date:  2004 May 
Date Detail:
Created Date:  2004-08-27     Completed Date:  2004-09-13     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  101147197     Medline TA:  J Vis     Country:  United States    
Other Details:
Languages:  eng     Pagination:  415-26     Citation Subset:  IM    
Physiological Laboratory, University of Cambridge, Cambridge, UK.
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MeSH Terms
Fourier Analysis
Motion Perception / physiology*
Optic Nerve / physiology*
Perceptual Distortion / physiology*
Photoreceptor Cells, Vertebrate / physiology*
Visual Pathways / physiology
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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