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| Research article summary (published 29 Apr 2002): |
Generalizing a neuropsychological model of visual categorization to auditory categorization of vowels.
Full Abstract
Twelve male listeners categorized 54 synthetic vowel stimuli that varied in second and third formant frequency on a Bark scale into the American English vowel categories [see text]. A neuropsychologically plausible model of categorization in the visual domain, the Striatal Pattern Classifier (SPC; Ashby & Waldron, 1999), is generalized to the auditory domain and applied separately to the data from each observer. Performance of the SPC is compared with that of the successful Normal A Posteriori Probability model (NAPP; Nearey, 1990; Nearey & Hogan, 1986) of auditory categorization. A version of the SPC that assumed piece-wise linear response region partitions provided a better account of the data than the SPC that assumed linear partitions, and was indistinguishable from a version that assumed quadratic response region partitions. A version of the NAPP model that assumed nonlinear response regions was superior to the NAPP model with linear partitions. The best fitting SPC provided a good account of each observer's data but was outperformed by the best fitting NAPP model. Implications for bridging the gap between the domains of visual and auditory categorization are discussed.
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Author information
Author/s: Maddox, W Todd (WT); Molis, Michelle R (MR); Diehl, Randy L (RL);
Affiliation: Department of Psychology, University of Texas, Austin 78712, USA. maddox@psy.utexas.edu
Grants: 5 R01 DC00427-11 (Agency:United States NIDCD) ; 5 R01 MH59196-03 (Agency:United States NIMH)
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: Perception & psychophysics (Percept Psychophys), published in United States. (Language: eng)
Reference: 2002-May; vol 64 (issue 4) : pp 584-97
Dates: Created 2002/07/22; Completed 2003/02/10; Revised 2007/11/14;
PMID: 12132760, 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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