Motion anisotropies and heading detection.

Abstract:

:In motion-processing areas of the visual cortex in cats and monkeys, an anisotropic distribution of direction selectivities displays a preference for movements away from the fovea. This 'centrifugal bias' has been hypothetically linked to the processing of optic flow fields generated during forward locomotion. In this paper, we show that flow fields induced on the retina in many natural situations of locomotion of higher mammals are indeed qualitatively centrifugal in structure, even when biologically plausible eye movements to stabilize gaze on environmental targets are performed. We propose a network model of heading detection that carries an anisotropy similar to the one found in cat and monkey. In simulations, this model reproduces a number of psychophysical results of human heading detection. It suggests that a recently reported human disability to correctly identify the direction of heading from optic flow when a certain type of eye movement is simulated might be linked to the noncentrifugal structure of the resulting retinal flow field and to the neurophysiological anisotropies.

journal_name

Biol Cybern

journal_title

Biological cybernetics

authors

Lappe M,Rauschecker JP

doi

10.1007/BF00201489

subject

Has Abstract

pub_date

1995-01-01 00:00:00

pages

261-77

issue

3

eissn

0340-1200

issn

1432-0770

journal_volume

72

pub_type

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