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Forward estimation of movement state in posterior parietal cortex

Summary: Forward estimation of movement state
in posterior parietal cortex
Grant H. Mulliken*, Sam Musallam
, and Richard A. Andersen*
*Computation and Neural Systems and Division of Biology, California Institute of Technology, Mail Code 216-76, Pasadena, CA 91125; and Department of
Electrical and Computer Engineering, McGill University, Montreal, QC, Canada H3A 2A7
This contribution is part of the special series of Inaugural Articles by members of the National Academy of Sciences elected on May 3, 2005.
Contributed by Richard A. Andersen, March 18, 2008 (sent for review November 16, 2007)
During goal-directed movements, primates are able to rapidly and
accurately control an online trajectory despite substantial delay
times incurred in the sensorimotor control loop. To address the
problem of large delays, it has been proposed that the brain uses
an internal forward model of the arm to estimate current and
upcoming states of a movement, which are more useful for rapid
online control. To study online control mechanisms in the posterior
parietal cortex (PPC), we recorded from single neurons while
monkeys performed a joystick task. Neurons encoded the static
target direction and the dynamic movement angle of the cursor.
The dynamic encoding properties of many movement angle neu-
rons reflected a forward estimate of the state of the cursor that is


Source: Andersen, Richard - Division of Biology, California Institute of Technology
Crawford, Doug - York Centre for Vision Research, York University (Toronto)


Collections: Biology and Medicine