Hemispatial neglect and visual search: a large scale analysis.
Visual search tasks have standardly been divided into two categories: those in which the target is detected through a serial, attention-driven search and those in which the target is detected rapidly in parallel and, apparently, without attentional processing. Several studies have examined this dist...
| Publicado en: | Cortex: A Journal Devoted to the Study of the Nervous System & Behavior Vol. 40; no. 2; pp. 247 - 264 |
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| Autores principales: | , , , , , |
| Formato: | research tables/charts Journal Article |
| Publicado: |
Masson SPA
Apr2004
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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=ccm&AN=106512106&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 106512106 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 00109452 GMP jtl: Cortex: A Journal Devoted to the Study of the Nervous System & Behavior issn: 00109452 maglogo: N pubinfo: dt: Apr2004 vid: 40 iid: 2 pid: 12473 pub: Masson SPA artinfo: ui: 106512106 106512106 NLM15156783 2009017851 NLM15156783 106512106 ppf: 247 ppct: 17 formats: tig: atl: Hemispatial neglect and visual search: a large scale analysis. aug: au: Behrmann M Ebert P Black SE Behrmann, Marlene Ebert, Patricia Black, Sandra E affil: Dept. of Psychology, Carnegie Mellon University, Pittsburgh, PA, USA sug: subj: Attention Stroke Physiopathology Dominance, Cerebral Physiology Perceptual Disorders Physiopathology Visual Perception Physiology Aged Analysis of Variance Brain Damage, Chronic Complications Brain Damage, Chronic Physiopathology Stroke Complications Chi Square Test Female Male Mental Processes Middle Age Perceptual Disorders Etiology Post Hoc Analysis Reaction Time Physiology Funding Source Human Aged: 65+ years Middle Aged: 45-64 years Female Male ab: Visual search tasks have standardly been divided into two categories: those in which the target is detected through a serial, attention-driven search and those in which the target is detected rapidly in parallel and, apparently, without attentional processing. Several studies have examined this distinction in patients with hemispatial neglect with the clear prediction that the former, but not the latter, should be impaired. These studies, however, have proved inconclusive. We have addressed this issue in a large sample of patients with unilateral hemispheric infarcts to the left or right hemisphere. In addition to measuring the patients' performance on both types of visual search tasks, we documented the presence and severity of neglect and of visual field defects in these same individuals. Patients with brain-damage with or without accompanying neglect were impaired at searching for the contralateral target on both forms of visual search, relative to normal control subjects, although this deficit was magnified in individuals with neglect and was also exacerbated by the presence of hemianopia. This pattern was also more pronounced in individuals with right-than with left-hemisphere lesions. The findings not only clarify the contradictory neuropsychological data but also provide clear evidence for the involvement of attentional processing in all forms of visual search. pubtype: Academic Journal doctype: research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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