PSYC 427 Study Guide - Final Guide: Antidromic, Motor Neuron, Frequency Distribution
Document Summary
Lec 9 motor cortex activity during voluntary movement. Selection criteria for pyramidal track neurons (ptns/cm cells) Weak intra cortical microstimulation of these neurons can evoke finger movements. When you stimulate these cells, get finger movements. Antidromic activation at short latency by medullary-pyramidal tract stimulation. Backward stimulate medullary-pyramidal tract and you get these contralateral cortical cells activated. Discharge varies in relation to voluntary finger movements. When you ask animal to move fingers, you can record activities in these cells. Output neurons should located in the anterior bank of cs. Activities in ptns precedes the onset of emg activity (muscle activity) in wrist movements (voluntary) Motor neuron activity is related to the direction of force application, not direction of actual movement. Motor neurons are responding to movement, not visual stimulus. Timing of motor cortex activity is closely correlated w timing of muscle activity. Frequency distribution of onset of activity in pre- and post-central neurons.
