Gamma oscillatory amplitude encodes stimulus intensity in primary somatosensory cortex


Gamma oscillations have previously been linked to pain perception and it has been hypothesised that they may have a potential role in encoding pain intensity. Stimulus response experiments have reported an increase in activity in the primary somatosensory cortex (SI) with increasing stimulus intensity, but the specific role of oscillatory dynamics in this change in activation remains unclear. In this study, Magnetoencephalography (MEG) was used to investigate the changes in cortical oscillations during 4 different intensities of a train of electrical stimuli to the right index finger, ranging from low sensation to strong pain. In those participants showing changes in evoked oscillatory gamma in SI during stimulation, the strength of the gamma power was found to increase with increasing stimulus intensity at both pain and sub-pain thresholds. These results suggest that evoked gamma oscillations in SI are not specific to pain but may have a role in encoding somatosensory stimulus intensity. © 2013 Rossiter, Worthen, Witton, Hall and Furlong.

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Divisions: College of Health & Life Sciences > School of Psychology
College of Health & Life Sciences > Clinical and Systems Neuroscience
College of Health & Life Sciences > Aston Institute of Health & Neurodevelopment (AIHN)
College of Health & Life Sciences
College of Health & Life Sciences > School of Optometry > Vision, Hearing and Language
Additional Information: Copyright © 2013 Rossiter, Worthen, Witton, Hall and Furlong. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in other forums, provided the original authors and source are credited and subject to any copyright notices concerning any third-party graphics etc.
Uncontrolled Keywords: electrical,gamma,pain,primary somatosensory cortex,stimulus intensity,Psychiatry and Mental health,Neurology,Biological Psychiatry,Behavioral Neuroscience,Neuropsychology and Physiological Psychology
Last Modified: 05 Apr 2024 07:10
Date Deposited: 07 Feb 2014 10:42
Full Text Link: http://www.fron ... 2013.00362/full
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2013-06-24
Authors: Rossiter, H.E.
Worthen, S.F. (ORCID Profile 0000-0003-1980-0932)
Witton, C. (ORCID Profile 0000-0002-5610-4234)
Hall, S.D.
Furlong, P.L. (ORCID Profile 0000-0002-9840-8586)



Version: Published Version

License: Creative Commons Attribution

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