ENS 307 Lecture Notes - Lecture 6: Stretch Reflex, Withdrawal Reflex, Spinal Cord
23 Mar 2020
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Document Summary
Motor learning & control - sensory & perceptual contributions in motor control. The central nervous system controls the contraction of muscles based on sensory information from. Sensors in tendons, muscles, and joints, skin, etc. A signal may be processed in two ways. Motor systems are organized hierarchically (3 levels) The same signal is processed simultaneously among many brain structures. Reflexive: involuntary, peripheral stimuli, contraction characteristics (muscle = stretch reflex & cutaneous = withdrawal reflex), defense mechanisms. Rhythmic: repetitive (walking, running, swimming, chewing), automatic, spinal and brainstem circuits (cpg"s - central pattern generators, triggered by sensory stimuli) Voluntary: goal-directed, improve with practice, feedback & feed-forward mechanisms. Sensation: the physical stimulus and its physical properties are registered by sensory organs, organs decode sensory information and sends it to the brain. Perception: how the brain interprets the sensation. Closed-loop control system: the body requires a system that controls itself for a long period of time. How sensory information is used to control action.
