PSYC 427 Lecture Notes - Lecture 11: Central Sulcus
Document Summary
Schieber generated this distribution of neural activity in m1 of monkey during individuated finger movements. Motor cortex lacks the type of somatotopic organization people would expect when looking at the penfield schematics. A: upper panel shows surface features including central sulcus and arcuate sulcus. Lower panel view from frontal pole shows population of m1 neurons beneath the surface convexity, with midline to left. B: distribution of single neuron activity during 12 instructed finger / wrist movements in frontal pole orientation. Each recorded neuron represented as a sphere colored according to instruction. C: each sphere represents maximum change in discharge frequency for that neuron for any of the 12 movements. Lower panel shows centroids for each instructed movement. Very top panel looking at the brain from the front balls = electrode location where activity is recorded during individuated finger movements. Monkey makes finger movements (voluntary), then record spike train. See both flexion and extension movements (in each column).
