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2010NatureAmerica,Inc.Allrightsreserved. nature neurOSCIenCe advance online publication

Summary: 2010NatureAmerica,Inc.Allrightsreserved.
nature neurOSCIenCe advance online publication
a r t I C l e S
Perceptual decision-making capacity has been intensely studied in
psychophysical and neurophysiological experiments as a function of
signal quality, strength and subjective value110. However, there is a
fundamental question that has been more difficult to address: how
long does it take to make a perceptual judgment? This issue is relevant
to many real-life situations in which a choice must be made very
quickly. For example, a driver sees a traffic light and must rapidly
decide whether to step on the brake or the accelerator. The ensuing
action on the pedal will take at least a few hundred milliseconds to
be initiated11,12. How much of this reaction time is dedicated to the
perceptual analysis of the visual scene--that is, to determining
whether the light is red or green?
The basic measurement seems deceptively simple. In well-trained
macaque monkeys, which are the subjects of our study, a fixational
eye movement (saccade) to a highly salient, unambiguous target
takes ~150200 ms to execute13. This must be the time that the
motor apparatus needs to produce an unambiguous response, so


Source: Andrzejak, Ralph Gregor - Departament de Tecnologia, Universitat Pompeu Fabra


Collections: Computer Technologies and Information Sciences