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Probability effects on stimulus evaluation and response processesThis study investigated the effects of probability information on response preparation and stimulus evaluation. Eight subjects responded with one hand to the target letter H and with the other to the target letter S. The target letter was surrounded by noise letters that were either the same as or different from the target letter. In 2 conditions, the targets were preceded by a warning stimulus unrelated to the target letter. In 2 other conditions, a warning letter predicted that the same letter or the opposite letter would appear as the imperative stimulus with .80 probability. Correct reaction times were faster and error rates were lower when imperative stimuli confirmed the predictions of the warning stimulus. Probability information affected (a) the preparation of motor responses during the foreperiod, (b) the development of expectancies for a particular target letter, and (c) a process sensitive to the identities of letter stimuli but not to their locations.
Document ID
20050000791
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Gehring, W. J.
(University of Illinois Champaign 61820)
Gratton, G.
Coles, M. G.
Donchin, E.
Date Acquired
August 22, 2013
Publication Date
February 1, 1992
Publication Information
Publication: Journal of experimental psychology. Human perception and performance
Volume: 18
Issue: 1
ISSN: 0096-1523
Subject Category
Behavioral Sciences
Funding Number(s)
CONTRACT_GRANT: MH41445
Distribution Limits
Public
Copyright
Other
Keywords
Non-NASA Center
NASA Discipline Space Human Factors

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