Involvement of middle temporal area (MT) in the processing of chromatic motion

  • We recorded single-neuron and multi-unit activity in cortical motion-processing area MT (V5) of anaesthetized paralyzed macaque monkeys in response to moving sinewave gratings modulated in both luminance and chromatic domain. The activity of MT neurons was highly dependent on luminance contrast. In 3 of 4 animals we found (isoluminant) modulations that did not activate any neuron. With the equivalent visual stimuli, in contrast, speed judgments and onset parameters of evoked optokinetic eye movements in human subjects were largely independent of luminance modulation. Motion of every grating (including isoluminant) was readily visible for all but one observer. Our results do not suggest a critical role of area MT in the processing of chromatic motion and do not support the idea of MT as a universal substrate for visual motion representation in the primate cerebral cortex.

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Metadaten
Author:Igor RiečanskýORCiDGND
URN:urn:nbn:de:hbz:294-11267
Subtitle (English):evidence from electrophysiological, psychophysical, and oculomotor experiments
Referee:Barry B. Lee, Ulf EyselGND
Document Type:Doctoral Thesis
Language:English
Date of Publication (online):2004/08/31
Date of first Publication:2004/08/31
Publishing Institution:Ruhr-Universität Bochum, Universitätsbibliothek
Granting Institution:Ruhr-Universität Bochum, International Graduate School of Neuroscience
Date of final exam:2004/03/24
Creating Corporation:International Graduate School of Neuroscience
GND-Keyword:Sehrinde; Bewegungswahrnehmung; Farbe; Chromatographie
Dewey Decimal Classification:Technik, Medizin, angewandte Wissenschaften / Medizin, Gesundheit
faculties:International Graduate School of Neuroscience (IGSN)
Licence (German):License LogoKeine Creative Commons Lizenz - es gelten der Veröffentlichungsvertrag und das deutsche Urheberrecht

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