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Abstract Rapid reaching movements of human and non-human primates are often characterized by irreg-
 

Summary: Abstract Rapid reaching movements of human and
non-human primates are often characterized by irreg-
ular multi-peaked velocity profiles. How to interpret
these irregularities is still under debate. While some
reports assert that these irregularities are the result of a
continuous controller interacting with the environ-
ment, we and others hold that the velocity irregularities
are evidence for a controller that produces discrete
movement corrections. Here we analyze rapid prona-
tion/supination wrist movements in monkey during a
1D step-tracking task, where visual perturbations of
the target were randomly introduced at movement
onset. We use our recently introduced algorithm
(Fishbach et al. in Exp Brain Res 164:442457, 2005) to
decompose an irregular movement into a primary
movement and one or more discrete, corrective sub-
movements. We first show that the visual perturbation
has almost no effect on primary movements. In
contrast, this perturbation influences the type and the
extent of the corrective submovements that often fol-

  

Source: Apkarian, A. Vania - Department of Physiology, Northwestern University

 

Collections: Biology and Medicine