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| Research article summary (published 30 Dec 2001): |
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Stimulus information contaminates summation tests of independent neural representations of features.
Full Abstract
Many models of visual processing assume that visual information is analyzed into separable and independent neural codes, or features. A common psychophysical test of independent features is known as a summation study, which measures performance in a detection, discrimination, or visual search task as the number of proposed features increases. Improvement in human performance with increasing number of available features is typically attributed to the summation, or combination, of information across independent neural coding of the features. In many instances, however, increasing the number of available features also increases the stimulus information in the task, as assessed by an optimal observer that does not include the independent neural codes. In a visual search task with spatial frequency and orientation as the component features, a particular set of stimuli were chosen so that all searches had equivalent stimulus information, regardless of the number of features. In this case, human performance did not improve with increasing number of features, implying that the improvement observed with additional features may be due to stimulus information and not the combination across independent features.
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Author information
Author/s: Shimozaki, Steven S (SS); Eckstein, Miguel P (MP); Abbey, Craig K (CK);
Affiliation: Department of Psychology, University of California, Santa Barbara, CA, USA. mshimozak@psych.ucsb.edu
Grants: 53455 (Agency:United States PHS)
Journal and publication information
Publication Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.
Journal: Journal of vision (J Vis), published in United States. (Language: eng)
Reference: 2002-; vol 2 (issue 5) : pp 354-70
Dates: Created 2003/04/07; Completed 2003/04/21; Revised 2008/04/29;
PMID: 12678651, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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