PSYC 2012 Lecture Notes - Lecture 26: Default Mode Network, Body Awareness, Temporal Lobe
Document Summary
Basal ganglia neurons receive input from the motor cortex and the substantia nigra on motor behavior and from the sensory cortex on the success of motor behaviors. Basal ganglia neurons send axons back to the motor cortex via the thalamus. Hyperkinetic symptoms and the direct pathway - involuntary and/or excessively forceful movements caused by damage to the indirect pathway - huntington"s chorea, tourette"s. Syndrome tics, obsessive behaviors in ocs, the mania of schizophrenia. Hypokinetic symptoms and the indirect pathway - rigidity and decreased movement production caused by damage to the direct pathway - parkinson"s disease. Basal ganglia regulated the likelihood and forcefulness of movements by modulating the drive or motivation the frontal cortex receives. The cortex sends movement information down the spinal cord to muscles. The cerebellum also receives a copy of this motor program from the cortex via the inferior olive. Cerebellum compares the motor program with sensory feedback about the movement.
