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J Neurophysiol 77: 137-144, 1997;
0022-3077/97 $5.00
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The Journal of Neurophysiology Vol. 77 No. 1 January 1997, pp. 137-144
Copyright ©1997 The American Physiological Society

Periodic Microstimulation of Single Mechanoreceptive Afferents Produces Frequency-Following Responses in Human EEG

Edward F. Kelly, Mats Trulsson, and Stephen E. Folger

Department of Diagnostic Sciences and Dental Research Center, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599; Department of Physiology, Umeå University, S-901 87 Umeå, Sweden; and Department of Biomedical Engineering and Dental Research Center, The University of North Carolina, Chapel Hill, North Carolina 27599

Kelly, Edward F., Mats Trulsson, and Stephen E. Folger. Periodic microstimulation of single mechanoreceptive afferents produces frequency-following responses in human EEG. J. Neurophysiol. 77: 137-144, 1997. Dense multichannel recordings of scalp electroencephalogram were obtained in the vicinity of primary somatosensory cortex, time-locked to repetitive train microstimulation of single, physiologically characterized skin mechanoreceptive afferents in the median nerve of a single human subject. Frequency-domain analysis of cross-trial averages for fast-adapting type one and slowly adapting type one afferents revealed prominent, topographically organized "driving" responses in the electroencephalogram at the frequency of stimulation, which vanished under various statistical and experimental control conditions. The responses also exhibited systematic declines in amplitude both across and within trials, and orderly changes in scalp topography as a function of the location of afferents' receptive fields on the hand. The observed response properties are tentatively explained in terms of characteristics of the pattern of afferent drive impressed on the cortex by microstimulation.




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