Pervasive synchronization of local neural networks in the secondary somatosensory cortex of cats during focal cutaneous stimulation.

Pervasive synchronization of local neural networks in the secondary somatosensory cortex of cats during focal cutaneous stimulation. Research Abstract Details 

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Pervasive synchronization of local neural networks in the secondary somatosensory cortex of cats during focal cutaneous stimulation. Abstract Text:

Kevin D Alloway,Mengliang Zhang,Susan H Dick,Stephane A Roy,

Extracellular discharges were recorded from 205 neurons in the secondary somatosensory (SII) cortex of isoflurane-anesthetized cats. Cross-correlation analysis was used to characterize the temporal coordination of SII neurons recorded during cutaneous stimulation with a focal air jet that moved back-and-forth across the distal forelimb. Over two-thirds of the recorded neuron pairs ( n=357) displayed significant levels of synchronized activity during one or both directions of air-jet movement. The probability of detecting correlated activity varied according to the distance separating the neurons. Whereas synchronized responses were observed in 82.3% of the pairs in which the neurons were separated by 200-300 micro m, the incidence of synchronization declined to 52.3% for neurons that were separated by 600-800 micro m. The distance between neurons also had a significant effect on the temporal precision of correlated activity. For neurons that were separated by 200-300 micro m, synchronized responses in the cross-correlograms (CCGs) were characterized by narrow (0.5-1.0 ms) peaks at time zero. For SII neurons that were more widely separated, the peak half-widths were substantially broader and more likely to be displaced from time zero. Analysis of directional sensitivity indicated that only 14.2% of the correlated neurons displayed a directional preference for synchronized activity. By comparison, 63.4% of the neurons displayed a directional preference in their discharge rate. These results indicate that stimulus-induced synchronization is a prominent feature among local populations of SII neurons, but synchronization does not appear to play a critical role in coding the direction of stimulus movement. A comparison of these results with those obtained from similar experiments conducted in primary somatosensory (SI) cortex indicates that neuronal synchronization is more likely in SII cortex. This finding is discussed with respect to the known functional differences between the SI and SII cortical areas.

Pervasive synchronization of local neural networks in the secondary somatosensory cortex of cats during focal cutaneous stimulation. Publishing Authors By Initials

KD Alloway,M Zhang,SH Dick,SA Roy,

For similar psychological phenomena and processes: mental processes: perception: touch research abstracts see: psychological phenomena and processes: mental processes: perception: touch research

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Pervasive synchronization of local neural networks in the secondary somatosensory cortex of cats during focal cutaneous stimulation. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: Experimental brain research. Experimentelle Hirnfo

VOLUME: 147

Page Numbers: 227-42

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ISSN: 0014-4819

DAY: 1

MONTH: 10

YEAR: 2002

Pervasive synchronization of local neural networks in the secondary somatosensory cortex of cats during focal cutaneous stimulation. Information

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LANGUAGE: eng

NlmUniqueID: 43312

Pervasive synchronization of local neural networks in the secondary somatosensory cortex of cats during focal cutaneous stimulation. Keywords Mesh Terms:

KEYWORDS: Touch

MESH TERMS: physiology

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Grant and Affiliation Information for Pervasive synchronization of local neural networks in the secondary somatosensory cortex of cats during focal cutaneous stimulation.

AFFILIATION: Department of Neuroscience and Anatomy, Milton S. Hershey Medical Center, Penn State University College of Medicine, Hershey, PA 17033-2255, USA. kda1@psu.edu

Country: Germany

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MEDLINETA: Exp Brain Res

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