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dc.contributor.authorGuenther, Franken_US
dc.contributor.authorNieto-Castanon, Alfonsoen_US
dc.contributor.authorGhosh, Satrajiten_US
dc.contributor.authorTourville, Jasonen_US
dc.date.accessioned2011-11-14T19:03:38Z
dc.date.available2011-11-14T19:03:38Z
dc.date.issued2002-09en_US
dc.identifier.urihttps://hdl.handle.net/2144/2297
dc.description.abstractWe used functional magnetic resonance imaging (fMRI) to investigate the representation of sound categories in human auditory cortex. Experiment 1 investigated the representation of prototypical and non-prototypical examples of a vowel sound. Listening to prototypical examples of a vowel resulted in less auditory cortical activation than listening to nonprototypical examples. Experiments 2 and 3 investigated the effects of categorization training and discrimination training with novel non-speech sounds on auditory cortical representations. The two training tasks were shown to have opposite effects on the auditory cortical representation of sounds experienced during training: discrimination training led to an increase in the amount of activation caused by the training stimuli, whereas categorization training led to decreased activation. These results indicate that the brain efficiently shifts neural resources away from regions of acoustic space where discrimination between sounds is not behaviorally important (e.g., near the center of a sound category) and toward regions where accurate discrimination is needed. The results also provide a straightforward neural account of learned aspects of categorical perception: sounds from the center of a category are more difficult to discriminate from each other than sounds near category boundaries because they are represented by fewer cells in the auditory cortical areas.en_US
dc.description.sponsorshipNational Institute on Deafness and Other Communication Disorders (R01 DC02852)en_US
dc.language.isoen_USen_US
dc.publisherBoston University Center for Adaptive Systems and Department of Cognitive and Neural Systemsen_US
dc.relation.ispartofseriesBU CAS/CNS Technical Reports;CAS/CNS-TR-2002-009en_US
dc.rightsCopyright 2002 Boston University. Permission to copy without fee all or part of this material is granted provided that: 1. The copies are not made or distributed for direct commercial advantage; 2. the report title, author, document number, and release date appear, and notice is given that copying is by permission of BOSTON UNIVERSITY TRUSTEES. To copy otherwise, or to republish, requires a fee and / or special permission.en_US
dc.subjectSpeechen_US
dc.subjectCortexen_US
dc.subjectAuditory comprehensionen_US
dc.titleRepresentation of Sound Categories in Auditory Cortical Mapsen_US
dc.typeTechnical Reporten_US
dc.rights.holderBoston University Trusteesen_US


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