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Isolation and characteristics of a steady-state visually-evoked potential in humans related to the motion of a stimulus

Snowden, Robert Jefferson, Ullrich, Dieter and Bach, Michael 1995. Isolation and characteristics of a steady-state visually-evoked potential in humans related to the motion of a stimulus. Vision Research 35 (10) , pp. 1365-1373. 10.1016/0042-6989(95)98716-M

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Abstract

We have examined the visual potential evoked by two motion stimuli. In the first stimulus (termed coherent motion) a random-dot pattern oscillated between phases of coherent and incoherent (“snowstorm”) motion, and in the second a random-dot pattern alternated in direction of motion (termed direction change). We found that the response to the coherent motion stimulus is low-pass with respect to speed, has low contrast sensitivity and increases steadily with the contrast of the stimuli. The direction change visually-evoked potential (VEP) is band-pass with respect to speed, has high contrast sensitivity but then saturates and even reduces as the stimulus contrast is raised above 0.1. The behaviour of the direction change VEP is similar in nature to results from psychophysical experiments of motion perception and to the known properties of directionally selective cells of the cortex. On the other hand the behaviour of the coherent motion VEP suggests this may not be mediated by a mechanism specific to motion.

Item Type: Article
Status: Published
Schools: Psychology
Uncontrolled Keywords: Motion; Visually-evoked potential; Contrast; Random-dot kinematograms
Publisher: Elsevier
ISSN: 0042-6989
Last Modified: 04 Jun 2017 04:10
URI: http://orca.cf.ac.uk/id/eprint/33886

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