Movement speed is biased by prior experience.

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.

journal_name

J Neurophysiol

authors

Hammerbeck U,Yousif N,Greenwood R,Rothwell JC,Diedrichsen J

doi

10.1152/jn.00522.2013

subject

Has Abstract

pub_date

2014-01-01 00:00:00

pages

128-34

issue

1

eissn

0022-3077

issn

1522-1598

pii

jn.00522.2013

journal_volume

111

pub_type

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