Voluntary Movement I.

	Psychophysical principles
	& Neural control of reaching and grasping

Introduction

	Reflex and voluntary movements are sensorimotor transformations.
		Feedforward vs. feedback control.
	Reflex control differs from voluntary control
		Spatial organization of reflexes reflects hard-wired connections vs. behavioral demands and context: decisions. Voluntary movements are organized to be appropriate to address behavioral goal: kinematic vs. dynamic transformations - internal models.
		Reflex latency & duration reflect mainly fixed neuromuscular constraints: conduction, transmission, contraction. These, also influence timing of voluntary movement, but information processing and accuracy constraints are the critical reaction time and movement duration.
		Neural organization of voluntary movements is highly dependent on learning and plasticity. Adaptability is critical over long term.

Today

Slide 4

Slide 5

Slide 6

Slide 7

Slide 8

Slide 9

Slide 10

Slide 11

Slide 12

Slide 13

Slide 14

Slide 15

Slide 16

Slide 17

Slide 18

Slide 19

Slide 20

Slide 21