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Information contained in sensory nerve recordings made with intrafascicular electrodes

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3 Author(s)
E. V. Goodall ; Dept. of Bioeng., Utah Univ., Salt Lake City, UT, USA ; T. M. Lefurge ; K. W. Horch

Multiunit recordings were made in anesthetized cats with chronically implanted intrafascicular electrodes over a period of six months. Neural signals recorded with these electrodes consisted of activity in sensory fibers innervating a variety of cutaneous mechanoreceptors. Mechanical stimuli were used to selectively activate individual nerve fibers, and the receptive field and receptor type were identified for each unit. Over a period of six months, there was a net shift in the recorded population, but the electrodes contained to provide a representative sample of the activity in the fascicle as a whole. The total number of units from which activity could be recorded remained roughly constant with time, and individual units persisted in the recordings for up to six months. These results indicate that intrafascicular electrodes could be used to sample information carried by individual somatosensory fibers on a long term basis.

Published in:

IEEE Transactions on Biomedical Engineering  (Volume:38 ,  Issue: 9 )