Test 2 guide

Test 2 guide - Proprioception,Touch,andVision 04:26

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Proprioception, Touch, and Vision 04:26 Sensory information is essental for all theories of motor control and learning. Information before the movement (need to know what to do before) Information during movement (feedback) Information after the movement ( to see errors and modify) Focus on three types Touch (somatic sensory system) Proprioception (somatic sensory system) Vision (Visual sensory system) Touch and Motor Control Neural Basis of Touch o Skin receptors give information Greatest concentration in fingertips Tactile receptors Pain receptors Temperature receptors Pressure receptors
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o Mechanoreceptors Mechanical pressure and distortion Detect skin stretch and joint movement Located in skin Provide info related to pain, temperature, and movement Activated upon touching object o Role of Tactile Information Movement accuracy Movement consistency Movement force adjustments Movement distance estimation Proprioception and Motor Control Proprioception= The sensory system’s detection and reception of movement  and spatial position of limbs, trunk, and head o Refers to our sensation and perception of limb, trunk, and head position  and movement. CNS receives information from proprioceptors o Direction o Location in space o Velocity o Muscle activation
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o Closed loop control- proprioceptive feedback o Open loop control- central commands control movement Proprioceptors= sensory neurons located in muscles, tendons, ligaments, and  joints o Pick up information about body and limb position and changes in position Types of Proprioceptors o Muscles Spindles o Golgi-tendon organds o Joint Receptors Muscle Spindles o Lie within most fibers of skeletal muscles o Contain a capsule with both sensory receptors and muscle fibers, known  as intrafusal muscle fibers o Type Ia axons (conduct impulses rapidly) are primary receptors o Mechanoreceptors o Detects changes in muscle fiber length (stretch) and velocity (velocity of  the stretch) o Involved with reflexes o Involved in voluntary movements o Most important source of proprioceptive info to the CNS about the limb  movement characteristics of position, direction, and velocity, as well as a  sense of effort o CNS uses limb movement feedback in control of a discrete movement that  must stop at a specific location in space and in control of ongoing  movements to ensure the spatial and temporal accuracy of the movements Golgi Tendon Organs (GTO) o In skeletal muscle near insertion of tendon o Detects changes in muscle tension (force)
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o Type Ib sensory axons o Respond to any tension created by the contracting muscle to  which it is 
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This note was uploaded on 02/03/2011 for the course KIN 3513 taught by Professor Porter during the Fall '08 term at LSU.

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Test 2 guide - Proprioception,Touch,andVision 04:26

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