Proprioceptive event related potentials: gating and task effects.
OBJECTIVE
The integration of proprioception with vision, touch or audition is considered basic to the developmental formation of perceptions, conceptual objects and the creation of cognitive schemes. Thus, mapping of proprioceptive information processing is important in cognitive research. A stimulus of a brisk change of weight on a hand held load elicit a proprioceptive evoked potential (PEP). Here this is used to examine early and late information processing related to weight discrimination by event related potentials (ERP).


METHODS
A gating paradigm having 1s between the proprioceptive stimuli of 100 g weight increase was recorded in 12 runs of 40 pairs and an 1:4 oddball task of discriminating between 40 and 100 g weight increase was both recorded in 24 healthy men. The subjects were stratified in 3 groups according to their discrimination errors.


RESULTS
The proprioceptive event related potential (PERP) consisted of a contralateral parietal P60, frontal N70, midline P100, initial contralateral later widespread N160, vertex P200, parietal N290 and target related widespread P360 and posterior N500. The target related components were augmented in the best performers, while the bad performers had delayed P60 and attenuated N70. The amplitudes of N160, P200 and N290 were unrelated to performance. Gating was seen as attenuation of P100, N160 and P200 amplitude.


CONCLUSIONS
The proprioceptive stimulus feature processing seem to be accomplished in the first 100 ms, while later components are modified by context as expected from previous findings in the somatosensory modality.


CONCLUSIONS
The PERP could be a useful research tool in the investigation of bodily information processing in neuropsychiatric disorders.
Arnfred
Sidse M
SM
Department of Psychiatry, Hvidovre Hospital, University Hospital of Copenhagen, Brøndbyøstervej 160, 2605 Brøndby, Copenhagen, Denmark. s.arnfred@tdcadsl.dk
D000328:Adult; D000704:Analysis of Variance; D004193:Discrimination Learning / Q000502:physiology*; D005071:Evoked Potentials / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011434:Proprioception / Q000502:physiology*; D011597:Psychomotor Performance / Q000502:physiology*; D011930:Reaction Time / Q000502:physiology*; D014110:Touch / Q000502:physiology