Gamma oscillatory amplitude encodes stimulus intensity in primary somatosensory cortex

Rossiter, H.E., Worthen, S.F., Witton, C., Hall, S.D. and Furlong, P.L. (2013). Gamma oscillatory amplitude encodes stimulus intensity in primary somatosensory cortex. Frontiers in Human Neuroscience, 7 (362),

Abstract

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.

Publication DOI: https://doi.org/10.3389/fnhum.2013.00362
Divisions: Life & Health Sciences > Psychology
Life & Health Sciences > Clinical and Systems Neuroscience
Life & Health Sciences > Aston Brain Centre
Life & Health Sciences
Life & Health Sciences > 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
Full Text Link: http://www.fron ... 2013.00362/full
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
Published Date: 2013-06-24
Authors: Rossiter, H.E.
Worthen, S.F. ( 0000-0003-1980-0932)
Witton, C. ( 0000-0002-5610-4234)
Hall, S.D.
Furlong, P.L. ( 0000-0002-9840-8586)

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License: Creative Commons Attribution


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