Temporal Vision Review Questions

Question 1

Compared to figure A (low amplitude), what has changed in figure B (high amplitude)?

Answer 1

High modulation depth

Question 2

A high temporal frequency stimulus may appear flickering at _____ rates.

Answer 2

Higher

Question 3

Temporal frequency is given in ‘hertz.’ 1 Hz is _____.

Answer 3

1 cycle/second

Question 4

1 cycle/degree

Answer 4

Spatial frequency

Question 5

Time taken by one cycle

Answer 5

Time period

Question 6

1 cycle/second

Answer 6

Temporal frequency = Hz

Question 7

Number of cycles of second

Answer 7

Frequency

Question 8

CFF for scotopic conditions is ____ compared to Photopic conditions.

Answer 8

Lower

Question 9

When testing under scotopic conditions, CFF is expected to be closest to:

Answer 9

20 Hz

Question 10

When testing under photopic conditions, CFF is expected to be closest to:

Answer 10

70 Hz

Question 11

The CFF for a given percentage modulation is 50 Hz. A stimulus of 55 Hz, presented at this given percentage modulation, is seen as:

Answer 11

Steady

Question 12

What is CFF?

Answer 12

Beyond which a stimulus appears steady (Critical flicker fusion frequency)

Question 13

Beyond CFF, the stimuli appears steady because ____.

Answer 13

It can’t be resolved (can’t resolve temporal fluctuations)

Question 14

As the area of the stimulus increases, the CFF ____.

Answer 14

Increases

Question 15

What happens to the CFF when the area of the stimulus gets to the periphery from the fovea?

Answer 15

Decreases

Question 16

If we change from 3 degrees stimulus size to 5 degrees stimulus size, what happens to the CFF?

Answer 16

Increases

Question 17

The detection of high temporal frequency is limited by what?

Answer 17

Speed of the neural processing

Question 18

Is lateral inhibition for higher or lower temporal frequency?

Answer 18

Lower temporal frequency

Question 19

The reduction in sensitivity to low temporal frequencies is caused by:

Answer 19

Lateral inhibition (phase lag)

Question 20

What prevents our visual world from disappearing when we fixate on an object?

Answer 20

Small, inhibitory eye movements

Question 21

With low temporal frequency, what happens to the edges?

Answer 21

Blurred up

Question 22

With high temporal frequency, what happens to the edges?

Answer 22

Sharper edges

Question 23

The saccades affect which temporal frequency, high or low?

Answer 23

Low because it makes the edges blurred up

Question 24

When the modulation depth is very small, the screen appears _____.

Answer 24

Steady (b/c low amplitude)

Question 25

The maximal TMTF (Temporal Modulation Transfer Function) value of a young healthy eye is ____ Hz.

Answer 25

10 Hz

Question 26

At what temporal frequency does the TMTF show maximal sensitivity?

Answer 26

Moderate

Question 27

When flickering light falls on the retina, nearby blood vessels ____.

Answer 27

Dilate

Question 28

The visual acuity of amblyopic patients is poorer when measured using a Snellen chart than when measured with isolated optotypes because of:

Answer 28

Simultaneous masking

Question 29

When a mask reduces sensitivity to previously presented spatially adjacent stimulus, the phenomenon is referred to as:

Answer 29

Meta contrast

Question 30

When optotypes are surrounded by spatial patterns, the visual acuity ____.

Answer 30

Decreases

Question 31

Masking in general does what to VA?

Answer 31

Reduces it

Question 32

When a stimulus' sensitivity is reduced due to a mask being presented first, the phenomenon is referred to as:

Answer 32

Para contrast