Individual movement variability magnitudes are explained by cortical neural variability

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Humans exhibit considerable motor variability even across trivial reaching movements. This variability can be separated into specific kinematic components such as extent and direction that are thought to be governed by distinct neural processes. Here, we report that individual subjects (males and females) exhibit different magnitudes of kinematic variability, which are consistent (within individual) across movements to different targets and regardless of which arm (right or left) was used to perform the movements. Simultaneous fMRI recordings revealed that the same subjects also exhibited different magnitudes of fMRI variability across movements in a variety of motor system areas. These fMRI variability magnitudes were also consistent across movements to different targets when performed with either arm. Cortical fMRI variability in the posterior-parietal cortex of individual subjects explained their movementextent variability. This relationship was apparent only in posterior-parietal cortex and not in other motor system areas, thereby suggesting that individuals with more variable movement preparation exhibit larger kinematic variability. We therefore propose that neural and kinematic variability are reliable and interrelated individual characteristics that may predispose individual subjects to exhibit distinct motor capabilities.

Original languageEnglish
Pages (from-to)9076-9085
Number of pages10
JournalJournal of Neuroscience
Volume37
Issue number37
DOIs
StatePublished - 1 Jan 2017

Keywords

  • FMRI
  • Motor control
  • Motor system
  • Movement variability
  • Neural variability

ASJC Scopus subject areas

  • General Neuroscience

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