PSY 436LEC Study Guide - Midterm Guide: Premotor Cortex, Wilder Penfield, Prefrontal Cortex
Document Summary
4 regions in the neocortex for skilled movement: Posterior cortex: specify movement goals send info to the prefrontal cortex. Premotor cortex: recognizes movement of others and selects similar or different actions. Electrical stimulation of the motor cortex: wilder penfield. Produced movement in diff areas of the body by stimulation the precentral gyrus. Disproportion in relative sizes of the body parts. As many as 10 homunculi in the motor and promote cortices. Motor cortex specialized for control of movements, rather than control of individual muscles. E. g. , defensive postures, movement of the hand to the mouth, etc. Spatial location to which the movement is directed. Most primate species use the pincer grip: when lesions occur to the thumb region of the cortex, weakness appears in all fingers. Lesion impairs not the muscles, but the overall action. Patients start to substitute the whole-hand grip for the pincer grip. More complex in premotor cortex than the primary motor cortex.
