Concentric and single fiber electrode spatial recording characteristics

John C. King, Daniel Dumitru, Sanjeev Nandedkar

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


A better appreciation of the specific spatial recording characteristics of the single fiber and concentric needle electrode can result in mere accurate physiologic and theoretical interpretations of single fiber and quantitative motor unit action potential analysis. We demonstrate by physical modeling that the 90% and 99% amplitude sensitivity envelopes are not simple hemispherical shapes. The 90% sensitivity concentric electrode volume does not extend beyond the insulated portion of the 15°beveled surface between the core and cannula and extends only 280 μm perpendicularly from the center of the cora's surface. The 99% envelope extends approximately 830 μm perpendicularly from the core's center. This is a much smaller volume of sensitivity than exists for a similarly modeled monopolar electrode. The 90% and 99% envelopes extend to 110 and 320 μm perpendicularly from the exposed single fiber core. Both the single fiber and concentric needle volumes of sensitivity have specific asymmetries described.

Original languageEnglish (US)
Pages (from-to)1525-1533
Number of pages9
JournalMuscle and Nerve
Issue number12
StatePublished - 1997


  • Concentric
  • Electrode modeling
  • Electrodes
  • Electrodiagnosis
  • Instrumentation
  • Motor unit action potential
  • Single fiber

ASJC Scopus subject areas

  • Physiology
  • Clinical Neurology
  • Cellular and Molecular Neuroscience
  • Physiology (medical)


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