Intrafascicular stimulation of monkey arm nerves evokes coordinated grasp and sensory responses

Noah M. Ledbetter, Christian Ethier, Emily R. Oby, Scott D. Hiatt, Andrew M. Wilder, Jason H. Ko, Sonya P. Agnew, Lee E. Miller, Gregory A. Clark

Research output: Contribution to journalArticlepeer-review

41 Scopus citations


High-count microelectrode arrays implanted in peripheral nerves could restore motor function after spinal cord injury or sensory function after limb loss. In this study, we implanted Utah Slanted Electrode Arrays (USEAs) intrafascicularly at the elbow or shoulder in arm nerves of rhesus monkeys (n = 4) under isoflurane anesthesia. Input-output curves indicated that pulse-widthmodulated single-electrode stimulation in each arm nerve could recruit single muscles with little or no recruitment of other muscles. Stimulus trains evoked specific, natural, hand movements, which could be combined via multielectrode stimulation to elicit coordinated power or pinch grasp. Stimulation also elicited short-latency evoked potentials (EPs) in primary somatosensory cortex, which might be used to provide sensory feedback from a prosthetic limb. These results demonstrate a high-resolution, high-channel-count interface to the peripheral nervous system for restoring hand function after neural injury or disruption or for examining nerve structure.

Original languageEnglish (US)
Pages (from-to)580-590
Number of pages11
JournalJournal of neurophysiology
Issue number2
StatePublished - Jan 15 2013


  • Functional electrical stimulation
  • Hand
  • Limb loss
  • Prosthesis
  • Spinal cord injury

ASJC Scopus subject areas

  • Physiology
  • Neuroscience(all)


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