Far-field recording of the junctional potential generated by median nerve volleys at the wrist

Jun Kimura, Tetsuro Ishida, Shoji Suzuki, Yutaka Kudo, Hiroo Matsuoka, Thoru Yamada

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


In 20 arms from 10 healthy subjects, the orthodromic median sensory volleys crossing the wrist gave rise to a stationary, biphasic potential rendering the forearm initially positive (Pw) and subsequently negative (Nw) compared with the hand. A pair of electrodes located on each side of the wrist best detected the junctional potential, Pw-Nw, that developed across the partition. Here the hand and the forearm each, in effect, acted as a lead, connecting any points within the respective compartment to the voltage source. Thus, nearly the same potential difference appeared across the wrist regardless of the inter-electrode distance, allowing the detection of the voltage step in far-field derivation. Our data verify that not only positive but also negative peaks of scalp-recorded evoked responses could represent junctional potentials generated along the course of the conduction medium in the absence of fixed neural discharges.

Original languageEnglish
Pages (from-to)1451-1457
Number of pages7
Issue number11
Publication statusPublished - 1986 Nov
Externally publishedYes

ASJC Scopus subject areas

  • Clinical Neurology


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