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Bulletin of the Psychonomic Society 1980, Vol. 15 (3), 163-166
 

Summary: Bulletin of the Psychonomic Society
1980, Vol. 15 (3), 163-166
A test of visual feature sampling
independence with orthogonal straight lines
JAMES T. TOWNSEND, GARY G. HU, and F. GREGORY ASHBY
Purdue University, West Lafayette, Indiana 47907
Well-specified feature detection models of visual character recognition typically assume
feature sampling independence; that is, they assume that the detection of one feature is
probabilistically independent of the detection of others. Recent results have suggested this
assumption may be suspect with letter-like stimuli. The present study utilized very simple
stimuli consisting of up to two straight-line segments that were either physically connected or
separated by a gap. A strong model that assumed that features are reported if and only if
they are sampled together with independence could not be rejected even when the lines were
connected.
In all of cognitive psychology, it would be difficult to
find a more ubiquitous concept than that of "feature."
It has been particularly important in perceptual disci-
plines due, perhaps, to the hallmark physiological papers
by Hubel and Wiesel (1962) on cats and earlier work by
Lettvin, Maturana, Pitts, and McCulloch (1961) on frogs,

  

Source: Ashby, F. Gregory - Department of Psychology, University of California at Santa Barbara
Townsend, James T. - Department of Psychological and Brain Sciences, Indiana University

 

Collections: Biology and Medicine; Computer Technologies and Information Sciences