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SpaceTime Separation During Obstacle-Avoidance Learning in Monkeys Elizabeth Torres and Richard Andersen
 

Summary: Space­Time Separation During Obstacle-Avoidance Learning in Monkeys
Elizabeth Torres and Richard Andersen
Biology Division, California Institute of Technology, Pasadena, California
Submitted 20 February 2006; accepted in final form 16 July 2006
Torres, Elizabeth and Richard Andersen. Space­time separation during
obstacle-avoidance learning in monkeys. J Neurophysiol 96: 2613­2632,
2006. First published July 19, 2006; doi:10.1152/jn.00188.2006. Is the
movement duration time known before we move? To answer this
question, a new experimental paradigm is introduced that for the first
time monitors the acquisition of a new motor skill in rhesus monkeys.
Straight reaches were interleaved with reaches around physical obsta-
cles that elicited a different path geometry. Curved and longer spatial
paths were immediately resolved and consistent over months of
training. A new temporal strategy separately evolved over repetitions
from multiple to a single velocity peak. We propose that the obstacle-
avoidance spatial paths were resolved before motion execution and
used as reference in the computation of the new dynamics. Path
conservation from the first trial occurred both at the hand and at the
joint angle levels, whereas the speed profile dramatically changed
over time. The spatial solution required no learning and was antici-

  

Source: Andersen, Richard - Division of Biology, California Institute of Technology

 

Collections: Biology and Medicine