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Titolo:
Prefrontal cortex neurons reflecting reports of a visual illusion
Autore:
Lebedev, MA; Douglass, DK; Moody, SL; Wise, SP;
Indirizzi:
NIMH, Lab Syst Neurosci, NIH, Bethesda, MD 20892 USA NIMH Bethesda MD USA20892 Lab Syst Neurosci, NIH, Bethesda, MD 20892 USA
Titolo Testata:
JOURNAL OF NEUROPHYSIOLOGY
fascicolo: 4, volume: 85, anno: 2001,
pagine: 1395 - 1411
SICI:
0022-3077(200104)85:4<1395:PCNRRO>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
FRONTAL EYE FIELD; SIZE-CONTRAST ILLUSIONS; WORKING-MEMORY; FUNCTIONAL-ORGANIZATION; BINOCULAR-RIVALRY; NEURAL ACTIVITY; UNIT-ACTIVITY; MACAQUE; OBJECT; PERCEPTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
62
Recensione:
Indirizzi per estratti:
Indirizzo: Wise, SP NIMH, Lab Syst Neurosci, NIH, 49 Convent Dr,Bldg 49,Rm B1EE17,MSC4401, Bethesda, MD 20892 USA NIMH 49 Convent Dr,Bldg 49,Rm B1EE17,MSC 4401Bethesda MD USA 20892
Citazione:
M.A. Lebedev et al., "Prefrontal cortex neurons reflecting reports of a visual illusion", J NEUROPHYS, 85(4), 2001, pp. 1395-1411

Abstract

When a small, focally attended visual stimulus and a larger background frame shift location at the same time, the frame's new location can affect spatial perception. For horizontal displacements on the order of 1-2 degrees, when the frame moves more than the attended stimulus, human subjects may perceive that the attended stimulus has shifted to the right or left when it has not done so. However, that misapprehension does not disable accurate eye movements to the same stimulus. We trained a rhesus monkey to report the direction that an attended stimulus had shifted by making an eye movement to one of the two report targets. Then, using conditions that induce displacement illusions in human subjects, we tested the hypothesis that neuronal activity in the prefrontal cortex (PF) would reflect the displacement directions reported by the monkey, even when they conflicted with the actual displacement, if any, of the attended stimulus. We also predicted that these cells would have directional selectivity for movements used to make those reports, but not for similar eye movements made to fixate the attended stimulus. A population of PF neurons showed the predicted properties, which could not be accounted for on the basis of either eye-movement or frame-shift parameters. This activity, termed report-related, began approximately 150 ms before the onset of the reporting saccade. Another population of PF neurons showed greater directional selectivity for saccadic eye movements made to fixate the attended stimulus than for similar saccades made to report its displacement. In view of the evidence that PF functions to integrate inputs and actions occurring at different times and places, the present findings support the idea that such integration involves movements to acquire responsetargets, directly, as well as actions guided by less direct response rules, such as perceptual reports.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/01/20 alle ore 04:12:18