Moving the arm at different rates: Slow movements are avoided

Robrecht P.R.D. Van Der Wel, Dagmar Sternad, David A. Rosenbaum

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

Qualitative and quantitative changes characterize locomotion and rhythmic interlimb coordination at different speeds. Legs and hands do not move more or less quickly; they also adopt different relative coordination patterns. In the present article, the authors asked whether similar transitions occur for unimanual hand movements when speed is slowed below the preferred speed. Participants moved a handheld dowel back and forth between 2 large circular targets in time with a metronome at periods between 370 ms and 1667 ms. The authors analyzed the kinematics of participants' movements at each period and found that proportional dwell time and number of peaks in the velocity profile increased as driving periods increased. Path lengths and peak velocities remained relatively constant for driving periods exceeding 800 ms. Participants made only gradual changes to their movement parameters, so that they went from a continuous mode to a more discrete mode of behavior for longer driving periods. Thus, unlike for rhythmic bimanual movements or locomotory patterns, there are quantitative but no clear qualitative changes for unimanual movements. The results suggest that participants tried to move close to their preferred tempo at different rates, and that they avoided moving slowly.

Original languageEnglish (US)
Pages (from-to)29-36
Number of pages8
JournalJournal of Motor Behavior
Volume42
Issue number1
DOIs
StatePublished - Dec 1 2009

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Orthopedics and Sports Medicine
  • Experimental and Cognitive Psychology
  • Cognitive Neuroscience

Keywords

  • Aiming
  • Coordination patterns
  • Dwell time
  • Preferred speed movement
  • Rate control

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