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The activity of neurones was recorded from the supplementary motor area (SMA) of monkeys while they were performing a discrete, arbitrary wrist movement. The cells responded similarly whether there was a triggering stimulus at the time of the movement or not. This experiment indicates that SMA neurones are active both in relation to externally triggered and internally initiated (voluntary) actions.


Journal article


Neurosci Lett

Publication Date





264 - 269


Animals, Electromyography, Macaca mulatta, Motor Activity, Motor Cortex, Neurons, Wrist