Smooth Pursuit Tophat

Question 1

T/F: step of target displacement is the stimulus for smooth pursuit eye movement

Answer 1

false; target velocity is the stimulus

Question 2

T/F: smooth pursuit is a conjugate & slow eye movement system

Answer 2

true

Question 3

T/F: retinal slip is measured as retinal velocity error (diff. b/w target velocity & smooth eye movement velocity)

Answer 3

true

Question 4

T/F: during smooth pursuit the initial movement was dictated by the motion, not position of the target

Answer 4

true

Question 5

T/F: smooth pursuit is initiated during the closed-loop phase & it’s maintained during the open-loop phase

Answer 5

false; initiated during open-loop phase & maintained during closed-loop phase

Question 6

T/F: duration of the early open-loop component is 80 msec

Answer 6

false; only lasts 20 msec

Question 7

T/F: the pursuit system has a latency of 200 msec (±25 msec)

Answer 7

false; 100-130 (±5 msec)

Question 8

T/F: the range of closed loop pursuit gain is 0.90-0.95 for target velocities up to 30-40 deg/sec

Answer 8

true

Question 9

T/F: amblyopia cause increase in smooth pursuit gain

Answer 9

false; reduces smooth pursuit gain

Question 10

T/F: central suppression scotoma in strabismus causes decrease in smooth pursuit gain

Answer 10

true

Question 11

T/F: MT/V5, FEF, & DPLN cortical & subcortical areas are involved in neurophysiological pathway of smooth pursuit eye movement

Answer 11

true

Question 12

which of the following disease conditions causes symmetric smooth pursuit impairment?

a. Huntington’s
b. Alzheimer’s
c. Parkinson’s
d. all of the above

Answer 12

all of the above