Proprioceptive evoked potentials in man: cerebral responses to changing weight loads on the hand.
We studied cerebral evoked potentials on the scalp to the stimulation of the right hand from a change in weight of 400-480 g in ten subjects. Rise-time was 20g/10 ms, Inter Stimulus Interval 2s and stimulus duration was 100 ms. The cerebral activations were a double positive contralateral C3'/P70, P190, and a single negative frontal Fz/N70 component. We conclude that a brisk change of a hand held load elicits a significant evoked potential (EP) unlike the electrical somato-sensory EP (SEP). The stimulus is perceived as applied force. For this reason we call it a proprioceptive EP (PEP). Further studies of the PEP are needed to assess the influence of load manipulations and of muscle contraction and to explore the effect of attentional manipulation.
Arnfred
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S
Department of Psychiatry, University Hospital of Copenhagen, Bispebjerg, Bispebjerg Bakke 23, DK-2400 NV, Kobenhavn, Denmark. sidse.arnfred@dadlnet.dk
Chen
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AC
Eder
D
D
Glenthoj
B
B
Hemmingsen
R
R
D000328:Adult; D001921:Brain / Q000502:physiology*; D004525:Efferent Pathways / Q000502:physiology; D004576:Electromyography; D005073:Evoked Potentials, Somatosensory / Q000502:physiology*; D006225:Hand / Q000502:physiology*; D006801:Humans; D008297:Male; D009044:Motor Cortex / Q000502:physiology; D011434:Proprioception / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology; D016474:Weight-Bearing / Q000502:physiology