Sensory contributions to motor control

Question 1

What are the 2 visual processing streams

Answer 1

Dorsal and Ventral

Question 2

Dorsal

Answer 2

(Motor and Action)
How to control the motor system to interact with objects

Question 3

Ventral

Answer 3

Cognitive and Perceptual
Recognition of objects b
Information in the environment; memory

Question 4

2 streams complementary

Answer 4

dorsal to pick it up and ventral to find and object

Question 5

Dorsal stream

Answer 5

“where”
Action
Peripheral vision
Damage results in optic ataxia

Question 6

Ventral Stream

Answer 6

“what”
perception
central vision
Damage results in visual agnosia

Question 7

Visual Feedback Depends on:

Answer 7

1. Nature of tasks
2. Type of visual information
3. Predictability

Question 8

Vestibular system

Answer 8

-saccule, utricle and semicirular canals
- provide information about the head in space (3 planes)

Question 9

Muscle Receptors - 2 main types

Answer 9

Muscle spindles (stretch)- provides information about limb position and velocity.

Golgi tendon organs (contract)- sensitive to muscle tension and protector of high force muscle contractions

Question 10

Joint Receptors- housed in joint capsule

Answer 10

fire near the extremes of the joint movement
(prevents injury by over stretch)

Question 11

Cutaneous Receptors

Answer 11

Touch, pressure and pain
(usually found in skin)

Question 13

Feedforward Influences on Motor Control

Answer 13

Sends a copy of the signal “ahead of” movement execution
- readies the system for the upcoming motor command
- readies the system to receive sensory feedback
- for display purpose, the reference of correctness in the schematic acts as feedforward model
- also known as “reference copy”

Question 14

Feedforward influences on control

Answer 14

efferences copy example

Move your eyes voluntarily via muscles (efference)
VS
Move eye with another effector (no-efference)