Parallel visuomotor processing in the split brain: cortico-subcortical interactions.
We tested nine patients with callosal pathology in a simple reaction time task with and without redundant targets in the same or opposite visual hemifield. Four patients showed large facilitation (redundancy gain) in the presence of a redundant target, exceeding probability summation models (neural...
| Publicado en: | Brain: A Journal of Neurology Vol. 123; no. 4; pp. 759 - 770 |
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| Autores principales: | , , , |
| Formato: | research Journal Article |
| Publicado: |
Oxford University Press / USA
Apr2000
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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=136565442&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 136565442 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 00068950 2RY jtl: Brain: A Journal of Neurology issn: 00068950 maglogo: N pubinfo: dt: Apr2000 vid: 123 iid: 4 pid: 622 pub: Oxford University Press / USA artinfo: ui: 136565442 136565442 NLM10734007 136565442 NLM10734007 136565442 ppf: 759 ppct: 11 formats: tig: atl: Parallel visuomotor processing in the split brain: cortico-subcortical interactions. aug: au: Iacoboni, M Ptito, A Weekes, N Y Zaidel, E affil: Brain Mapping Division, Department of Psychiatry and Biobehavioral Sciences, UCLA School of Medicine, Los Angeles, CA 90095-7085, USA sug: subj: Brain Physiopathology Dominance, Cerebral Physiology Psychomotor Performance Models, Biological Occipital Lobe Physiopathology Telencephalon Physiopathology Telencephalon Pathology Human Probability Magnetic Resonance Imaging Agenesis of Corpus Callosum Cerebral Cortex Physiopathology Validation Studies Comparative Studies Evaluation Research Multicenter Studies Clinical Assessment Tools ab: We tested nine patients with callosal pathology in a simple reaction time task with and without redundant targets in the same or opposite visual hemifield. Four patients showed large facilitation (redundancy gain) in the presence of a redundant target, exceeding probability summation models (neural summation). Five patients showed redundancy gain not exceeding probability models. Violation of probability models was not associated with a specific type of callosal lesion. Neural summation, which probably occurs at collicular level, may be modulated by cortical activity. To test this hypothesis, we used functional MRI. During detection of redundant simultaneous targets, activations in the extrastriate cortex were observed in a patient with callosal agenesis and redundancy gain violating probability models, but not in a patient with callosal agenesis and redundancy gain not exceeding probability models. We conclude that cortical activity in the extrastriate cortex may be a modulating factor in the magnitude of the redundancy gain during parallel visuomotor transforms. pubtype: Academic Journal doctype: research Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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