Experiments with Monkeys Tracking Hand Movements with Electrical Stimulation to Different

Experiments with monkeys tracking hand movements with electrical stimulation to different sites in the motor cortex revealed what information about the motor cortex map?

A) the effect of cortical stimulation may vary with the prior location of the limb in space
B) microstimulation of specific sites on the motor cortex activates a single muscles
C) adjacent stimulation sites on the motor cortex always stimulate adjacent muscles
D) prolonged stimulation of specific sites on the motor cortex causes muscle fatigue
E) none of the above