The influence of stimulus chromaticity on the isoluminant motion-onset VEP

Vision Research
D J McKeefry

Abstract

Motion-onset visual evoked potentials (VEPs) were elicited by low spatial frequency chromatic isoluminant gratings presented in a central 7 degrees circular field. The chromatic composition of the stimuli was varied so as to modulate along different axes in colour space. For slow speeds (<5 degrees/s) changing the chromatic axis induced large response differences between the S- and L/M-cone VEPs. At faster speeds (5-12 degrees/s) the effects were not as marked. A dichotomy between the slow and fast responses was also shown to exist in terms of their contrast dependencies, the former exhibiting a stronger dependency on contrast than the latter. These findings suggest that neural substrates with chromatic sensitivity are involved in the generation of S- and L/M-cone mediated motion-onset VEPs at low velocities. At higher velocities, responses are generated by different mechanisms that possess little or no chromatic sensitivity.

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Citations

Sep 20, 2005·Experimental Brain Research·Igor RiecanskýKlaus-Peter Hoffmann
Apr 14, 2007·Documenta Ophthalmologica. Advances in Ophthalmology·Sven P Heinrich
Mar 9, 2007·Vision Research·José M Medina, Kathy T Mullen
Nov 30, 2006·Vision Research·M KubaJ Langrová
May 1, 2005·Environmental Toxicology and Pharmacology·D F VenturaL C L Silveira

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