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Titolo:
Synchronization of local neural networks in the somatosensory cortex: A comparison of stationary and moving stimuli
Autore:
Roy, S; Alloway, KD;
Indirizzi:
PennHershey,niv, Milton S Hershey Med Ctr, Coll Med, Dept Anat & Neurosci,Penn State Univ Hershey PA USA 17033 Ctr, Coll Med, Dept Anat & Neurosci,
Titolo Testata:
JOURNAL OF NEUROPHYSIOLOGY
fascicolo: 3, volume: 81, anno: 1999,
pagine: 999 - 1013
SICI:
0022-3077(199903)81:3<999:SOLNNI>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
CAT VISUAL-CORTEX; CROSS-CORRELATION ANALYSIS; PRIMARY AUDITORY-CORTEX; SOMATIC SENSORY CORTEX; AWAKE MONKEYS; RECEPTIVE-FIELDS; THALAMOCORTICAL INTERACTIONS; NEURONAL OSCILLATIONS; SENSORIMOTOR CORTEX; CORTICAL-NEURONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
67
Recensione:
Indirizzi per estratti:
Indirizzo: Alloway, KD PennHershey,niv, Milton S Hershey Med Ctr, Coll Med, Dept Anat& Neurosci, Penn State Univ Hershey PA USA 17033 d, Dept Anat & Neurosci,
Citazione:
S. Roy e K.D. Alloway, "Synchronization of local neural networks in the somatosensory cortex: A comparison of stationary and moving stimuli", J NEUROPHYS, 81(3), 1999, pp. 999-1013

Abstract

Spontaneous and stimulus-induced responses were recorded from neighboring groups of neurons by an array of electrodes in the primary (SI) somatosensory cortex of intact, halothane-anesthetized cats. Cross-correlation analysis was used to characterize the coordination of spontaneous activity and theresponses to peripheral stimulation with moving or stationary air jets. Although synchronization was detected in only 10% (88 of 880) of the pairs ofsingle neurons that were recorded, cross-correlation analysis of multiunitresponses revealed significant levels of synchronization in 64% of the 123recorded electrode pairs. Compared with spontaneous activity, both stationary and moving air jets caused substantial increases in the rate, proportion, and temporal precision of synchronized activity in local regions of SI cortex. Among populations of neurons that were synchronized by both types ofair-jet stimulation, the mean rate of synchronized activity was significantly higher during moving air-jet stimulation than during stationary air-jetstimulation. Moving air jets also produced significantly higher correlation coefficients than stationary air jets in the raw cross-correlograms (CCGs) but not in the shift-corrected CCGs. The incidence and rate of stimulus-induced synchronization varied with the distance separating the recording sites. For sites separated by less than or equal to 300 mu m, 80% of the multiunit responses displayed significant levels of synchronization during bothtypes of air-jet stimulation. For sites separated by less than or equal to500 mu m, only 37% of the multiunit responses were synchronized by discrete stimulation with a single air jet. Measurements of the multiunit CCG peakhalf-widths showed that the correlated activity produced by moving air jets had slightly less temporal variability than that produced by stationary air jets. These results indicate that moving stimuli produce greater levels of synchronization than stationary stimuli among local groups of SI neuronsand suggest that neuronal synchronization may supplement the changes in firing rate which code intensity and other attributes of a cutaneous stimulus.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/03/20 alle ore 13:25:22