Dissociation Between Hand Motion And Population Vectors From Neural Activity In Motor Cortex

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rj =+ ~cos() !!j N Isotropic preferred-torque distributions

[1] Non-uniform distribution of reach-related and torque-related activity in upper arm muscles and neurons of primary motor cortex. Isaac Kurtzer, Troy M. Herter, Stephen H. Scott. Articles in Press. J Neurophysiol, September, 2006 [2] Dissociation between hand motion and population vectors from neural activity in motor cortex.

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Apostolos P. Georgopoulos, Thomas Naselaris, Hugo Merchant

motion constraints involving only flexion and extension of the shoulder and elbow, movements can be made to targets on a plane in contrast to the prediction of the population vector. As pointed out shortly after the publication of that paper, these findings may simply be the result of a small sampling size, the

letters to nature

hand-space. In order to save time during the viscous load conditions, neural activity was recorded only to targets at 908 and 2708, directions associated with large shoulder and elbow rotations, and thus large loads (Supplementary Information). Data analysis Cell activity was represented as the number of action potentials recorded between 150 ms

Supplementary Information Kinematics and kinetics of reaching

The robotic device is designed such that motor 1 applies loads at the shoulder while motor 2 applies loads at both the shoulder and elbow joints1. In order to generate a viscous load at the elbow, motor 1 and motor 2 are programmed to generate loads of equal magnitude but opposite in sign. Any difference in the magnitude of torque

Supplementary Information for Dissociation between hand

Supplementary Information for Dissociation between hand motion and population vectors from neural activity in motor cortex Nature, V413, 161 Methods and Additional Notes Preferred Direction of a cell. The activity of cells from monkeys a and b (39% of total sample) were recorded for 8 targets that were not

Nature V413, 161

Supplementary Information for Dissociation between hand motion and population vectors from neural activity in motor cortex Nature, V413, 161 Methods and Additional Notes Preferred Direction of a cell. The activity of cells from monkeys a and b (39% of total sample) were