PSY-B - Psychology PSY-B 320 Lecture Notes - Lecture 27: Pyramidal Tracts, Dorsal Root Of Spinal Nerve, Corticospinal Tract
21 Mar 2017
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Review: hierarchy of movement control: major components of the motor system: If you (cid:272)ould divide the (cid:271)rai(cid:374) i(cid:374)to just 2 (cid:373)ajor parts . Forebrain (whole outer/upper region) prominent in mammals and birds, responsible for most conscious behaviors. Brainstem source of behavior in simpler animals,responsible for most of our unconscious behaviors. Brainstem and species-typical movement: species-typical behavior, hess (1950s) Actions produced by every member of a species (e. g. , hissing in cats) Stimulated different areas within the brainstem to produce different species- specific behaviors. Some sites produced head turning, others produced walking or running, and still others elicited displays of aggression or fear. Maintaining posture, standing upright, coordinating movements of the limbs, swimming and walking, grooming the fur, and making nests: rat nest-building behavior very specific pattern and sequence of behaviors controlled by the brainstem. In humans and other animals with a severed spinal cord, spinal reflexes still function even though the spinal cord is cut off from communication with the brain.
