PMID: 9176947Jan 1, 1997Paper

Selective stimulation of colour mechanisms: an empirical perspective

Spatial Vision
J J KulikowskiA G Robson

Abstract

Anatomically distinct parvo and magno visual pathways show considerable functional overlap. However, specific stimulation of the most sensitive colour-opponent parvo-neurones is still possible, provided that colour stimuli are verified for selectivity. The authors have shown that gratings of low contrast, low spatial frequency and of restricted spatial content (6 or less spatial cycles) are optimal stimuli for distinguishing between colour-related (tritan and red/green) from achromatic or partly chromatic responses. This is particularly important when recording global responses, such as visual evoked potentials, VEPs. The crucial point is that at low presentation rates (< 2 Hz), colour-related onset VEPs are maximally different from contrast reversal VEPs, thereby reflecting the activity of sustained-type parvo mechanisms. Achromatic onset, offset and reversal VEPs are similar, reflecting mediation by transient-type magno mechanisms. A stringent test of colour-response specificity is to check whether the chromatic reversal VEP has a low-pass temporal tuning curve, since it becomes band-pass when substantial achromatic intrusions are present. Specification of chromatic isoluminant stimuli, e.g. along cardinal axes, does not guar...Continue Reading

Citations

Mar 4, 2011·Documenta Ophthalmologica. Advances in Ophthalmology·Mei Ying BoonCatherine Suttle
Oct 10, 2002·The European Journal of Neuroscience·T R VidyasagarB Dreher
Jun 20, 2001·Vision Research·D J McKeefry
Sep 24, 2005·Perception·Rigmor C Baraas
Sep 24, 2005·Perception·Kathy T MullenWilliam Chu
Sep 24, 2005·Perception·Richard L Gregory

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