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Normal and Defective Colour Vision$
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John D. Mollon, Joel Pokorny, and Ken Knoblauch

Print publication date: 2003

Print ISBN-13: 9780198525301

Published to Oxford Scholarship Online: April 2010

DOI: 10.1093/acprof:oso/9780198525301.001.0001

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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 19 October 2021

Integration Times Reveal Mechanisms Responding to Isoluminant Chromatic Gratings: A Two-Centre Visual Evoked Potential Study

Integration Times Reveal Mechanisms Responding to Isoluminant Chromatic Gratings: A Two-Centre Visual Evoked Potential Study

Chapter:
(p.130) Chapter 14 Integration Times Reveal Mechanisms Responding to Isoluminant Chromatic Gratings: A Two-Centre Visual Evoked Potential Study
Source:
Normal and Defective Colour Vision
Author(s):

A. G. Robson

J. J. Kulikowski

M. Korostenskaja

M. M. Neveu

C. R. Hogg

G. E. Holder

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198525301.003.0014

Visual evoked potentials (VEPs) provide an objective technique for monitoring the integrity of visual pathways and have been used to monitor the activity of post-receptoral chromatic mechanisms. The temporal properties of visual processing may now be characterized in terms of VEP integration time, defined as the stimulus duration during which response components are summed to give the highest amplitude VEP. The onset of a luminance-modulated pattern of moderate spatial frequency elicits the largest VEP when the grating appearance is brief, i.e. about 40-60 ms, consistent with predominant activation of transient mechanisms. Likewise, the greatest amplitude chromatic VEPs are obtained with isoluminant coarse L/M gratings when the offset period exceeds the onset duration. This chapter compares L/M tritan integration times by obtaining VEP responses to the onset of two cycles per deg gratings of varying onset durations, in order to characterize the temporal response mechanisms contributing to the two chromatic processing streams.

Keywords:   visual evoked potentials, visual pathways, chromatic mechanisms, visual processing

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