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Pupil responses associated with coloured afterimages are mediated by the magno-cellular pathway
Authors
Aguilar
Alpern
+23 more
B. Gilmartin
Barbur
Barbur
Burbeck
Chaparro
J.S. Wolffsohn
Kelly
Kimura
Kohn
Lee
MacLeod
Merigan
Pokorny
S. Tsujimura
Schiller
Silverman
Smith
Smith
Stromeyer
Tsujimura
Tsujimura
Tsujimura
Young
Publication date
1 June 2003
Publisher
'Elsevier BV'
Doi
Cite
Abstract
Sustained fixation of a bright coloured stimulus will, on extinction of the stimulus and continued steady fixation, induce an afterimage whose colour is complementary to that of the initial stimulus; an effect thought to be caused by fatigue of cones and/or of cone-opponent processes to different colours. However, to date, very little is known about the specific pathway that causes the coloured afterimage. Using isoluminant coloured stimuli recent studies have shown that pupil constriction is induced by onset and offset of the stimulus, the latter being attributed specifically to the subsequent emergence of the coloured afterimage. The aim of the study was to investigate how the offset pupillary constriction is generated in terms of input signals from discrete functional elements of the magno- and/or parvo-cellular pathways, which are known principally to convey, respectively, luminance and colour signals. Changes in pupil size were monitored continuously by digital analysis of an infra-red image of the pupil while observers viewed isoluminant green pulsed, ramped or luminance masked stimuli presented on a computer monitor. It was found that the amplitude of the offset pupillary constriction decreases when a pulsed stimulus is replaced by a temporally ramped stimulus and is eliminated by a luminance mask. These findings indicate for the first time that pupillary constriction associated with a coloured afterimage is mediated by the magno-cellular pathway. © 2003 Elsevier Science Ltd. All rights reserved
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