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Titolo:
Responses of neurons in macaque area V4 during memory-guided visual search
Autore:
Chelazzi, L; Miller, EK; Duncan, J; Desimone, R;
Indirizzi:
Univ Verona, Physiol Sect, Dept Neurol & Vis Sci, I-37121 Verona, Italy Univ Verona Verona Italy I-37121 Neurol & Vis Sci, I-37121 Verona, Italy NIMH, Neuropsychol Lab, Bethesda, MD 20892 USA NIMH Bethesda MD USA 20892NIMH, Neuropsychol Lab, Bethesda, MD 20892 USA MIT, Dept Brain & Cognit Sci, RIKEN MIT Neurosci Res Ctr, Ctr Learning & Memory, Cambridge, MA 02139 USA MIT Cambridge MA USA 02139 Ctr Learning & Memory, Cambridge, MA 02139 USA MRC, Cognit & Brain Sci Unit, Cambridge, England MRC Cambridge EnglandMRC, Cognit & Brain Sci Unit, Cambridge, England
Titolo Testata:
CEREBRAL CORTEX
fascicolo: 8, volume: 11, anno: 2001,
pagine: 761 - 772
SICI:
1047-3211(200108)11:8<761:RONIMA>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
INFERIOR TEMPORAL CORTEX; PRIMATE PREFRONTAL CORTEX; SACCADE TARGET SELECTION; FRONTAL EYE FIELD; NEURAL MECHANISMS; RHESUS-MONKEY; VISUOTOPIC ORGANIZATION; EXTRASTRIATE CORTEX; DIRECTED ATTENTION; LESIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
44
Recensione:
Indirizzi per estratti:
Indirizzo: Chelazzi, L Univ Verona, Physiol Sect, Dept Neurol & Vis Sci, Str Grazie 8, I-37121 Verona, Italy Univ Verona Str Grazie 8 Verona Italy I-37121 1 Verona, Italy
Citazione:
L. Chelazzi et al., "Responses of neurons in macaque area V4 during memory-guided visual search", CEREB CORT, 11(8), 2001, pp. 761-772

Abstract

In a typical scene with many different objects, attentional mechanisms areneeded to select relevant objects for visual processing and control over behavior. To test the role of area V4 in the selection of objects based on non-spatial features, we recorded from V4 neurons in the monkey, using a visual search paradigm. A cue stimulus was presented at the center of gaze, followed by a blank delay period. After the delay, a two-stimulus array was presented extrafoveally, and the monkey was rewarded for detecting the target stimulus matching the cue. The array was composed of one 'good' stimulus (effective in driving the cell when presented alone) and one 'poor' stimulus (ineffective in driving the cell when presented alone). When the choice array was presented in the receptive field (RF) of the neuron, many calls showed suppressive interactions between the stimuli as well as strong attention effects. Within 150-200 ms of array onset, responses to the array were determined by the target stimulus. If the target was the good stimulus, the response to the array became equal to the response to the good stimulus presented alone. If the target was the poor stimulus, the response approached the response to that stimulus presented alone. Thus the influence of the nontarget stimulus was filtered out. These effects were reduced or eliminatedwhen the poor stimulus was located outside the RF and, therefore, no longer competing for the cell's response. Overall, the results support a 'biasedcompetition' model of attention, according to which objects in the visual field compete for representation in the cortex, and this competition is biased in favor of the behaviorally relevant object.

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Documento generato il 22/01/20 alle ore 19:03:17