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Journal of Experimental Psychology: Copyright 1996 by the American Psychological Association, Inc. Human Perception and Performance 0096-1523/96/$3.00
 

Summary: Journal of Experimental Psychology: Copyright 1996 by the American Psychological Association, Inc.
Human Perception and Performance 0096-1523/96/$3.00
1996, Vol. 22, No. 4, 795-817
Perceptual Separability, Decisional Separability, and the
Identification-Speeded Classification Relationship
W. Todd Maddox
Arizona State University
F. Gregory Ashby
University of California, Santa Barbara
Three observers participated in several sessions of identification and speeded classification.
Predictions from F. G. Ashby and W. T. Maddox's (1994a) response time (RT) theory of
speeded classification were tested. A key theoretical concept is decisional separability (DS),
that is, that the decision about the level of 1 component does not depend on the perceived
value of the other component. The theory predicted that DS would hold in the filtering task
but would be violated in the redundancy task, resulting in redundancy gains. To summarize
the results, (a) DS held in the filtering conditions, but not in the redundancy conditions; (b)
redundancy gains occurred; (c) despite the redundancy gains, strong evidence was obtained
that the stimulus components are perceptually separable; (d) 2 new models that each assumed
RT decreases with the distance between the percept and the decision bound provided good
accounts of the RT distributions and accuracy rates; and (e) the shift from identification to

  

Source: Ashby, F. Gregory - Department of Psychology, University of California at Santa Barbara

 

Collections: Biology and Medicine; Computer Technologies and Information Sciences