Proximodistal gradient in the perception of delayed stiffness

Ilana Nisky, Pierre Baraduc, Amir Karniel

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Proximal and distal muscles are different in size, maximum force, mechanical action, and neuromuscular control. In the current study we explore the perception of delayed stiffness when probing is executed using movement of different joints. We found a proximodistal gradient in the amount of underestimation of delayed stiffness in the transition between probing with shoulder, elbow, and wrist joints. Moreover, there was a similar gradient in the optimal weighting between estimation of stiffness and the inverse of estimation of compliance that predicted the perception of the subjects. These gradients could not be ascribed to differences in movement amplitude, duration, velocity, and force amplitude because these variables were not significantly modulated by the joint used for probing. Mean force did not follow a similar gradient either. Therefore we suggest that the observed gradient in perception reveals a proximodistal gradient in control, such that proximal joints are dominated by force control, whereas distal joints are dominated by position control.

Original languageEnglish
Pages (from-to)3017-3026
Number of pages10
JournalJournal of Neurophysiology
Volume103
Issue number6
DOIs
StatePublished - 1 Jun 2010

ASJC Scopus subject areas

  • Neuroscience (all)
  • Physiology

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