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Titolo:
Visuo-spatial neural response interactions in early cortical processing during a simple reaction time task: a high-density electrical mapping study
Autore:
Murray, MM; Foxe, JJ; Higgins, BA; Javitt, DC; Schroeder, CE;
Indirizzi:
Nathan S Kline Inst Psychiat Res, Cognit Neurophysiol Lab, Cognit Neurosci& Schizophrenia Program, Orangeburg, NY 10962 USA Nathan S Kline Inst Psychiat Res Orangeburg NY USA 10962 rg, NY 10962 USA Albert Einstein Coll Med, Dept Neurosci, Bronx, NY 10461 USA Albert Einstein Coll Med Bronx NY USA 10461 Neurosci, Bronx, NY 10461 USA Albert Einstein Coll Med, Dept Psychiat & Behav Sci, Bronx, NY 10461 USA Albert Einstein Coll Med Bronx NY USA 10461 ehav Sci, Bronx, NY 10461 USA NYU, Sch Med, Dept Psychiat, New York, NY 10016 USA NYU New York NY USA 10016 Sch Med, Dept Psychiat, New York, NY 10016 USA
Titolo Testata:
NEUROPSYCHOLOGIA
fascicolo: 8, volume: 39, anno: 2001,
pagine: 828 - 844
SICI:
0028-3932(2001)39:8<828:VNRIIE>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTERHEMISPHERIC TRANSMISSION TIME; HUMAN CEREBRAL-CORTEX; EVOKED-POTENTIALS; CALLOSAL CONNECTIONS; FUNCTIONAL-ANALYSIS; AWAKE MACAQUE; AREAS; BRAIN; ORGANIZATION; STIMULI;
Keywords:
redundant target effect; RTE; event-related potential; ERP; neurophysiology; EEG;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social & Behavioral Sciences
Life Sciences
Citazioni:
67
Recensione:
Indirizzi per estratti:
Indirizzo: Schroeder, CE Nathan S Kline Inst Psychiat Res, Cognit Neurophysiol Lab, Cognit Neurosci& Schizophrenia Program, 140 Old Orangeburg Rd, Orangeburg, NY 10962 USA Nathan S Kline Inst Psychiat Res 140 Old Orangeburg Rd Orangeburg NY USA 10962
Citazione:
M.M. Murray et al., "Visuo-spatial neural response interactions in early cortical processing during a simple reaction time task: a high-density electrical mapping study", NEUROPSYCHO, 39(8), 2001, pp. 828-844

Abstract

The timecourse and scalp topography of interactions between neural responses to stimuli in different visual quadrants, straddling either the verticalor horizontal meridian, were studied in 15 subjects. Visual evoked potentials (VEPs) were recorded From 64 electrodes during a simple reaction time (RT) task. VEPs to single stimuli displayed in different quadrants were summed ('sum') and compared to the VEP response from simultaneous stimulation of the same two quadrants ('pair'). These responses would be equivalent if the neural responses to the single stimuli were independent. Divergence between the 'pair' and 'sum' VEPs indicates a neural response interaction. In each visual field. interactions occurred within 72-86 ms post-stimulus over parieto-occipital brain regions. Independent of visual quadrant, RTs were faster for stimulus pairs than single stimuli. This replicates the redundanttarget effect (RTE) observed for bilateral stimulus pairs and generalizes the RTE to unilateral stimulus pairs. Using Miller's 'race model inequality(Miller J. Divided attention: evidence for coactivation with redundant signals, Cognitive Psychology 1982:14:247-79), we found that probability summation could fully account for the RTE in each visual field. Although measurements from voltage waveforms replicated the observation of earlier peak P1 latencies for the 'pair' versus 'sum comparison (Miniussi C, Girelli M, Marzi CA. Neural site of the redundant target effect: electrophysiological evidence. Journal of Cognitive Neuroscience 1998,10:216-30), this did not holdwith measurements taken from second derivative (scalp current density) waveforms. Since interaction effects for bilateral stimulus pairs occurred within 86 ms and require interhemispheric transfer. transcallosal volleys mustarrive within 86 ms, which is earlier than previously calculated. Interaction effects for bilateral conditions were delayed by approximate to 10 ms versus unilateral conditions. consistent with current estimates of interhemispheric transmission time. Interaction effects place an upper limit on the lime required for neuronal ensembles to combine inputs from different quadrants of visual space ( approximate to 72 ms for unilateral and approximate to 82 ms for bilateral conditions). (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 08/04/20 alle ore 11:12:10