Principles of Motor Coordination

Question 1

When does max aperture happen in reach-and-grasp

Answer 1

3/4 of displacement

Question 2

What does the CNS “think about” when setting up a motor command?

Answer 2

1. Where to move (end point)?

2. How to move (acceleratory characteristics)?

Question 3

Kinematics

Answer 3

Provide descriptions of motion without consideration of the forces applied to joints (distance, speed, etc)

Question 4

4 Aspects of kinematics

Answer 4

Position(displacement)
Velocity
Acceleration
Jerk

Question 5

Arm Movement Kinematics characteristics

Answer 5

1. Bell shaped velocity, equal time spent accelerating and decelerating
2. Most energetically efficient way (small a in f=ma)
3. movements planned as trajectories

Question 6

Are elbow and shoulder movement simultaneous during straight line hand path?

Answer 6

Yes

Question 7

Effect on coordination movement of cerebellar damage

Answer 7

Rhythmic task:
Irregular position
Lack of clear alternating phasic muscle activity

Question 8

prehension two steps

Answer 8

act of taking hold

1. Reach (transport) phase
2. Grasp phase (aperture formation)

Question 9

Bilateral grasp 2 features

Answer 9

1. hand velocity peak at half duration

2. aperture peak at half deceleration

Question 10

Drawer opening task with cerebellar patients

Answer 10

Temporal synchronization at start and end of the task affected

Question 11

saccades

Answer 11

rapid eye movement
“foveate” to object of interest
~30ms in duration
precede limb movement

Question 12

smooth pursuit

Answer 12

slow eye movements

continuous tracking