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Titolo:
Oscillations in the premotor cortex: single-unit activity from awake, behaving monkeys
Autore:
Lebedev, MA; 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:
EXPERIMENTAL BRAIN RESEARCH
fascicolo: 2, volume: 130, anno: 2000,
pagine: 195 - 215
SICI:
0014-4819(200001)130:2<195:OITPCS>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
PRIMARY SOMATOSENSORY CORTEX; FIELD POTENTIAL OSCILLATIONS; SPONTANEOUS FIRING PATTERNS; CUED HAND MOVEMENTS; CAT VISUAL-CORTEX; NEURONAL-ACTIVITY; MOTOR CORTEX; SENSORIMOTOR CORTEX; RHESUS-MONKEYS; DEPENDENT MODULATION;
Keywords:
visually guided movement; motor cortex; sensorimotor cortex; rhythmicity; spike trains;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
79
Recensione:
Indirizzi per estratti:
Indirizzo: Lebedev, MA NIMH, Lab Syst Neurosci, NIH, 49 Convent Dr,Bldg 49,Room B1EE17,MSC 4401, Bethesda, MD 20892 USA NIMH 49 Convent Dr,Bldg 49,Room B1EE17,MSC 4401 Bethesda MD USA 20892
Citazione:
M.A. Lebedev e S.P. Wise, "Oscillations in the premotor cortex: single-unit activity from awake, behaving monkeys", EXP BRAIN R, 130(2), 2000, pp. 195-215

Abstract

We examined single-unit activity in the dorsal premotor cortex for evidence of fast neuronal oscillations. Four rhesus monkeys performed a task in which visuospatial instruction stimuli indicated the direction of forelimb movement to be executed on each trial. After an instructed delay period of 1.5-3 s, movements to either the right or left of a central origin were triggered by a second visuospatial stimulus. From a database of 579 single units, 78 units (13%) contained periodic peaks in their autocorrelation histograms (ACHs), with oscillation frequencies typically 20-30 Hz (mean 27 Hz). Anadditional 26 units (5%) had oscillatory features that were identified in joint interspike-interval (ISI) plots. Three observations, taken together, suggest entrainment by rhythmic drive extrinsic to these neurons: shufflingISIs attenuated ACH peaks, indicating a dependency on serial-order effects; oscillation frequency did not change during either increases or decreasesin firing rate; and joint ISI plots contained features consistent with a rhythmicity interrupted by intervening discharges. In some cells, oscillations occurred for only one of the two directions of movement. During the delay period, such directional selectivity was observed in 37 units (60% of delay-period oscillators). For at least 17 of these units, we could exclude the possibility that oscillatory directional selectivity resulted from the difficulty in detecting oscillations due to low discharge rates (for one of the two movement directions). Directional selectivity in fast oscillations shows that they can reflect specific aspects of an intended action.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/03/20 alle ore 19:46:04