Exam 8: Action

Activity in the premotor cortex reflects not only the trajectory of a movement but also the context in which the movement occurs.

Corticospinal fibers originate primarily in the

What is a population vector? How do population vectors play a role in the initiation of a movement?

Why is the basal ganglia structure referred to as a "gatekeeper?" How is inhibition used in its gatekeeping functions?

A patient has damage to the basal ganglia, particularly within the striatum, and demonstrates both chorea and hyperkinesia. What is your diagnosis?

Before a movement is initiated, the population vector in the motor cortex has already shifted in the direction of the planned movement.

In the period of time immediately following focal brain injury to the supplementary motor cortex, patients may reach out and grasp objects with the affected arm when they have not been asked to do so, or even when they have been explicitly told not to do so. This is an example of

Which of the following statements best describes the population vector associated with a reaching movement from left to right?