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Visual attention and metacontrast modify latency to perception in opposite directions

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons84015

Kirschfeld,  K
Former Department Comparative Neurobiology, Max Planck Institute for Biological Cybernetics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons84000

Kammer,  T
Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Former Department Comparative Neurobiology, Max Planck Institute for Biological Cybernetics, Max Planck Society;

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Kirschfeld, K., & Kammer, T. (2000). Visual attention and metacontrast modify latency to perception in opposite directions. Vision Research, 40(9), 1027-1033. doi:10.1016/S0042-6989(00)00040-7.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-E507-B
Abstract
In human observers, cue-induced visual attention (‘bottom-up‘ transient focal attention) shortens the latency of perception. Metacontrast reduces the intensity of perception and can even obliterate it. We show that a close relationship exists between both, but that their effects are reversed: cue-induced visual attention not only shortens latency but also intensifies perception, and metacontrast not only lowers intensity of perception but also prolongs latency. A common neurophysiological mechanism for both is possible. Indirect evidence suggests that this could be a subthreshold modulation of neuronal thresholds by de- and hyperpolarization. (C) 2000 Elsevier Science Ltd. All rights reserved.