WEEK 3: VISUAL PSYCHOPHYSICS Flashcards
1
Q
What is 1 lux?
A
1 sqm surface 1 m away
2
Q
What is night vision called?
A
Scotopic Rod Vision
3
Q
What is twilight vision called?
A
Mesopic Rod and Cone Vision
4
Q
What is day light vision called?
A
Photopic Cone Vision
5
Q
What it the property of convergence?
A
Multiple rod photoreceptors synapse with one bipolar cell
6
Q
What are the 3 types of cones and the colours?
A
S cones = blue light (400 - 500)
M cones = Green light (450 - 650)
L cones = Red light (450 - 700)
7
Q
How many of each cone are there in each eye?
A
115 million rod photoreceptors
6.5 million cone photoreceptors
40 million bipolar cells
1.2 million RGC
8
Q
What is threshold?
A
The minimum quantity of stimulus that can be perceived
9
Q
What are the pyschophysical method?
A
Method of ascending/descending limits Staircase (4 reversals in threshold) Method of constant stimuli Method of adjustment forced choice
