Gamma synchronization in human primary somatosensory cortex as revealed by somatosensory evoked neuromagnetic fields

Franca Tecchio, Claudio Babiloni, Filippo Zappasodi, Fabrizio Vecchio, Vittorio Pizzella, Gian Luca Romani, Paolo Maria Rossini

Research output: Contribution to journalArticle

Abstract

Cortical sensory neurons synchronize their activity at multiple frequency bands after an external stimulation. In the somatosensory cortical areas, previous reports describe more discrete and somatotopically specific neural synchronization at the gamma band. Therefore, an efficient gamma synchronization of the neurons in primary somatosensory cortex (S1) may be expected to characterize the stimulus processing from the thumb, i.e. the hand's most skillful area. To test this hypothesis, neuromagnetic fields were evoked over human S1 by the electrical stimulation of the contralateral thumb or little finger. Neuronal synchronization was indexed by the spectral coherence of the evoked neuromagnetic fields overlying S1. The frequencies of interest were the beta (16-32 Hz) and gamma (36-46 Hz) bands. The global amount of the coherence was defined as the total event-related coherence (ERCoh) among all magnetic sensors overlying the S1. Results showed prevalent increment of beta ERCoh (20-32 Hz) after the little finger stimulation and of gamma ERCoh (36-44 Hz) after the thumb stimulation. These results suggest that the neural synchronization in S1, as revealed by the ERCoh, may vary in frequency as a function of the finger stimulated. In this framework, the neural synchronization at gamma band may characterize the cortical representation of thumb, functionally prevalent with respect to little finger in humans.

Original languageEnglish
Pages (from-to)63-70
Number of pages8
JournalBrain Research
Volume986
Issue number1-2
DOIs
Publication statusPublished - Oct 3 2003

Fingerprint

Somatosensory Cortex
Thumb
Fingers
Sensory Receptor Cells
Electric Stimulation
Hand
Neurons

Keywords

  • Gamma band
  • Magnetoencephalography
  • Somatosensory evoked field
  • Spectral coherence

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Gamma synchronization in human primary somatosensory cortex as revealed by somatosensory evoked neuromagnetic fields. / Tecchio, Franca; Babiloni, Claudio; Zappasodi, Filippo; Vecchio, Fabrizio; Pizzella, Vittorio; Romani, Gian Luca; Rossini, Paolo Maria.

In: Brain Research, Vol. 986, No. 1-2, 03.10.2003, p. 63-70.

Research output: Contribution to journalArticle

Tecchio, Franca ; Babiloni, Claudio ; Zappasodi, Filippo ; Vecchio, Fabrizio ; Pizzella, Vittorio ; Romani, Gian Luca ; Rossini, Paolo Maria. / Gamma synchronization in human primary somatosensory cortex as revealed by somatosensory evoked neuromagnetic fields. In: Brain Research. 2003 ; Vol. 986, No. 1-2. pp. 63-70.
@article{e6180046f4864188898b5f49c079ad39,
title = "Gamma synchronization in human primary somatosensory cortex as revealed by somatosensory evoked neuromagnetic fields",
abstract = "Cortical sensory neurons synchronize their activity at multiple frequency bands after an external stimulation. In the somatosensory cortical areas, previous reports describe more discrete and somatotopically specific neural synchronization at the gamma band. Therefore, an efficient gamma synchronization of the neurons in primary somatosensory cortex (S1) may be expected to characterize the stimulus processing from the thumb, i.e. the hand's most skillful area. To test this hypothesis, neuromagnetic fields were evoked over human S1 by the electrical stimulation of the contralateral thumb or little finger. Neuronal synchronization was indexed by the spectral coherence of the evoked neuromagnetic fields overlying S1. The frequencies of interest were the beta (16-32 Hz) and gamma (36-46 Hz) bands. The global amount of the coherence was defined as the total event-related coherence (ERCoh) among all magnetic sensors overlying the S1. Results showed prevalent increment of beta ERCoh (20-32 Hz) after the little finger stimulation and of gamma ERCoh (36-44 Hz) after the thumb stimulation. These results suggest that the neural synchronization in S1, as revealed by the ERCoh, may vary in frequency as a function of the finger stimulated. In this framework, the neural synchronization at gamma band may characterize the cortical representation of thumb, functionally prevalent with respect to little finger in humans.",
keywords = "Gamma band, Magnetoencephalography, Somatosensory evoked field, Spectral coherence",
author = "Franca Tecchio and Claudio Babiloni and Filippo Zappasodi and Fabrizio Vecchio and Vittorio Pizzella and Romani, {Gian Luca} and Rossini, {Paolo Maria}",
year = "2003",
month = "10",
day = "3",
doi = "10.1016/S0006-8993(03)03171-8",
language = "English",
volume = "986",
pages = "63--70",
journal = "Brain Research",
issn = "0006-8993",
publisher = "Elsevier",
number = "1-2",

}

TY - JOUR

T1 - Gamma synchronization in human primary somatosensory cortex as revealed by somatosensory evoked neuromagnetic fields

AU - Tecchio, Franca

AU - Babiloni, Claudio

AU - Zappasodi, Filippo

AU - Vecchio, Fabrizio

AU - Pizzella, Vittorio

AU - Romani, Gian Luca

AU - Rossini, Paolo Maria

PY - 2003/10/3

Y1 - 2003/10/3

N2 - Cortical sensory neurons synchronize their activity at multiple frequency bands after an external stimulation. In the somatosensory cortical areas, previous reports describe more discrete and somatotopically specific neural synchronization at the gamma band. Therefore, an efficient gamma synchronization of the neurons in primary somatosensory cortex (S1) may be expected to characterize the stimulus processing from the thumb, i.e. the hand's most skillful area. To test this hypothesis, neuromagnetic fields were evoked over human S1 by the electrical stimulation of the contralateral thumb or little finger. Neuronal synchronization was indexed by the spectral coherence of the evoked neuromagnetic fields overlying S1. The frequencies of interest were the beta (16-32 Hz) and gamma (36-46 Hz) bands. The global amount of the coherence was defined as the total event-related coherence (ERCoh) among all magnetic sensors overlying the S1. Results showed prevalent increment of beta ERCoh (20-32 Hz) after the little finger stimulation and of gamma ERCoh (36-44 Hz) after the thumb stimulation. These results suggest that the neural synchronization in S1, as revealed by the ERCoh, may vary in frequency as a function of the finger stimulated. In this framework, the neural synchronization at gamma band may characterize the cortical representation of thumb, functionally prevalent with respect to little finger in humans.

AB - Cortical sensory neurons synchronize their activity at multiple frequency bands after an external stimulation. In the somatosensory cortical areas, previous reports describe more discrete and somatotopically specific neural synchronization at the gamma band. Therefore, an efficient gamma synchronization of the neurons in primary somatosensory cortex (S1) may be expected to characterize the stimulus processing from the thumb, i.e. the hand's most skillful area. To test this hypothesis, neuromagnetic fields were evoked over human S1 by the electrical stimulation of the contralateral thumb or little finger. Neuronal synchronization was indexed by the spectral coherence of the evoked neuromagnetic fields overlying S1. The frequencies of interest were the beta (16-32 Hz) and gamma (36-46 Hz) bands. The global amount of the coherence was defined as the total event-related coherence (ERCoh) among all magnetic sensors overlying the S1. Results showed prevalent increment of beta ERCoh (20-32 Hz) after the little finger stimulation and of gamma ERCoh (36-44 Hz) after the thumb stimulation. These results suggest that the neural synchronization in S1, as revealed by the ERCoh, may vary in frequency as a function of the finger stimulated. In this framework, the neural synchronization at gamma band may characterize the cortical representation of thumb, functionally prevalent with respect to little finger in humans.

KW - Gamma band

KW - Magnetoencephalography

KW - Somatosensory evoked field

KW - Spectral coherence

UR - http://www.scopus.com/inward/record.url?scp=0142058847&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0142058847&partnerID=8YFLogxK

U2 - 10.1016/S0006-8993(03)03171-8

DO - 10.1016/S0006-8993(03)03171-8

M3 - Article

C2 - 12965230

AN - SCOPUS:0142058847

VL - 986

SP - 63

EP - 70

JO - Brain Research

JF - Brain Research

SN - 0006-8993

IS - 1-2

ER -