Lec 13

Question 1

difference b/t Kinesthesis and Proprioception

Answer 1

proprio = unconscious perception of body position, includes reflexes

Kinesth = conscious perception of limb movement including tesnion/force, effort, heaviness and posture (not reflexes)

Question 2

Name the sources of kinesthesis and proprioception and what each does

Answer 2

Muscle spindles - velocity and length of muscle

GTO’s - force generated, and tension resulting at tendon

Skin receptors - length, velocity, joint angle, accelleration via skin stretch and length

Joint receptors - pressure in joint capsule, pressure due to contraction, joint movement

Question 3

Evidence of importance of sensory input in movement and control. (Hint: Waterman, GL, animal studies)

Answer 3

Animal studies - cut dorsal roots (rhizotomy) = afferent info not come in. Impairs movement and balance.

GL and Waterman - must look at their limbs to move accurately. De-afferented.

Therefore afferent info is important

Question 4

do muscles spindles play a role in kinesthesis, what experiment shows this?

Answer 4

Yes help with sense of joint position. Experiment where vibrate muscle spindles, give illusion of joint movement and position change. Vibrated muscle perceived as longer. Faster vibration = longer and faster movement. Pinnochio effect.

Can make ppl think their nose grows by stim bicep while holding nose.

Question 5

What would you feel from muscle spindles if your tendon was pulled, but there was no movement at the joint

Answer 5

You would feel like your muscle is lengthening