Movement speed is biased by prior experience

Ulrike Hammerbeck, Nada Yousif, Richard Greenwood, John C Rothwell, Jörn Diedrichsen

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)
25 Downloads (Pure)

Abstract

How does the motor system choose the speed for any given movement? Many current models assume a process that finds the optimal balance between the costs of moving fast and the rewards of achieving the goal. Here, we show that such models also need to take into account a prior representation of preferred movement speed, which can be changed by prolonged practice. In a time-constrained reaching task, human participants made 25-cm reaching movements within 300, 500, 700, or 900 ms. They were then trained for 3 days to execute the movement at either the slowest (900-ms) or fastest (300-ms) speed. When retested on the 4th day, movements executed under all four time constraints were biased toward the speed of the trained movement. In addition, trial-to-trial variation in speed of the trained movement was significantly reduced. These findings are indicative of a use-dependent mechanism that biases the selection of speed. Reduced speed variability was also associated with reduced errors in movement amplitude for the fast training group, which generalized nearly fully to a new movement direction. In contrast, changes in perpendicular error were specific to the trained direction. In sum, our results suggest the existence of a relatively stable but modifiable prior of preferred movement speed that influences the choice of movement speed under a range of task constraints.

Original languageEnglish
Pages (from-to)128-134
Number of pages7
JournalJournal of Neurophysiology
Volume111
Issue number1
Early online date1 Jan 2014
DOIs
Publication statusPublished - 1 Jan 2014

Keywords

  • Adult
  • Female
  • Humans
  • Male
  • Motor Skills
  • Practice (Psychology)
  • Task Performance and Analysis
  • Time Factors

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