Superadditive effects of multiple lesions in connectionist architecture: implications for the neuropsychology of optic aphasia.
Neuropsychological disorders have traditionally been understood in terms of a focal lesion to a single component of a cognitive architecture. Optic aphasia (OA) defies explanation in this way. In OA, naming of visual stimuli is impaired in the absence of general visual agnosia or anomia. OA has b...
| Publicado en: | Psychological Review Vol. 107; no. 4; pp. 709 - 735 |
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| Autores principales: | , , |
| Formato: | Artículo |
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American Psychological Association
October 2000
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ssf&AN=507721402&site=ehost-live header: @attributes: shortDbName: ssf uiTerm: 507721402 longDbName: Social Sciences Full Text (H.W. Wilson) uiTag: AN controlInfo: bkinfo: jinfo: jid: 0033295X PYV jtl: Psychological Review issn: 0033295X maglogo: N pubinfo: dt: October 2000 vid: 107 iid: 4 pid: 34 pub: American Psychological Association artinfo: ui: 507721402 10.1037/0033-295X.107.4.709 ppf: 709 ppct: 26 formats: tig: atl: Superadditive effects of multiple lesions in connectionist architecture: implications for the neuropsychology of optic aphasia. aug: au: Sitton, Mark Mozer, Michael C. Farah, Martha J. su: Brain function localization Aphasia Visual learning Neuropsychology sug: subj: Brain function localization Aphasia Visual learning Neuropsychology ab: Neuropsychological disorders have traditionally been understood in terms of a focal lesion to a single component of a cognitive architecture. Optic aphasia (OA) defies explanation in this way. In OA, naming of visual stimuli is impaired in the absence of general visual agnosia or anomia. OA has been explained by positing multiple semantic systems or multiple functional pathways to visual naming. M. J. Farah (1990) instead sketched a parsimonious account based on multiple lesions—to pathways mapping visual input to semantics and semantics to naming responses—and the assumption that the effects of the lesions are superadditive. The authors demonstrate superadditive effects of damage in a connectionist architecture and model other phenomena associated with OA. Multiple lesions with superadditivity provide a novel class of explanations for neuropsychological deficits that previously seemed to imply the existence of highly specialized processing components. Reprinted by permission of the publisher. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: N holdings: @attributes: islocal: N |
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