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Titolo:
Dissociating 'what' and 'how' in visual form agnosia: a computational investigation

Autore:

Indirizzi:: Univ Iowa, Dept Psychol, Iowa City, IA 52242 USA Univ Iowa Iowa City IA USA 52242 a, Dept Psychol, Iowa City, IA 52242 USA
Titolo Testata:: NEUROPSYCHOLOGIA
fascicolo: 2, volume: 40, anno: 2002,
pagine: 187 - 204
SICI:: 0028-3932(2002)40:2<187:D'A'IV>2.0.ZU;2-7
Fonte:: ISI
Lingua:: ENG
Soggetto:: APPERCEPTIVE AGNOSIA; HAND ACTION; PERCEPTION; CORTEX; PATHWAYS; BRAIN; RECOGNITION; BLINDSIGHT; DYSLEXIA; NEGLECT;
Keywords:: vision; apperceptive agnosia; visual form agnosia; dorsal visual pathway; ventral visual pathway;
Tipo documento:: Article
Natura:: Periodico
Settore Disciplinare:: Social & Behavioral Sciences; Life Sciences
Citazioni:: 51
Recensione:
Indirizzi per estratti:: Indirizzo: Vecera, SP Univ Iowa, Dept Psychol, 11 Seashore Hall E, Iowa City, IA 52242 USA Univ Iowa 11 Seashore Hall E Iowa City IA USA 52242 A 52242 USA



Citazione:: S.P. Vecera, "Dissociating 'what' and 'how' in visual form agnosia: a computational investigation", NEUROPSYCHO, 40(2), 2002, pp. 187-204

Abstract

Patients with visual form agnosia exhibit a profound impairment in shape perception (what an object is) coupled with intact visuomotor functions (howto act on an object), demonstrating a dissociation between visual perception and action. How can these patients act on objects that they cannot perceive? Although two explanations of this 'what-how' dissociation have been offered, each explanation has shortcomings. A 'pathway information' account of the 'what-how' dissociation is presented in this paper. This account hypothesizes that 'where' and `how' tasks require less information than `what' tasks, thereby allowing 'where/how' to remain relatively spared in the faceof neurological damage. Simulations with a neural network model test the predictions of the pathway information account. Following damage to an inputlayer common to the `what' and 'where/how' pathways, the model performs object identification more poorly than spatial localization. Thus, the model offers a parsimonious explanation of differential 'what-how' performance invisual form agnosia. The simulation results are discussed in terms of their implications for visual form agnosia and other neuropsychological syndromes. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/06/13 alle ore 15:21:02