Week 1 (ch 1&2

Question 1

two theroies of Psychophysics ?

Answer 1

Gustau fechnar

Erent weber

Question 2

Gustau Theroy

Answer 2

Measuring how strong a signal needs to be detected

Question 3

Psychometric function

Answer 3

Smooth increase curve in neural variability

Question 4

absolute threshold

Answer 4

min intensity required to be detected by observer

Question 5

Thresholds(Limes)

Answer 5

a level on the psychometric function (midpoint)

Question 6

subliminal perception

Answer 6

a level below the Limen

Question 7

Whats the procedure for adjusting the intensity of the signal?

Answer 7

Method of limits
Method of Adjustment
Method of Constant stimuli

Question 8

Whats Fechnar formula

Answer 8

S = K Log(I/Io)
K = Same as Weber's law
I = Intensity 
Io = Assolute threshold

Question 9

Ernst Weber

Answer 9

Relationship between stimulus intensity and its psychological impact

Question 10

JND abbreviation

Answer 10

Just noticeable difference

Question 11

What is JND

Answer 11

How much difference is required to detect change

Question 12

Webers Formula

Answer 12

JND = K I
K = Constant
I = Intensity

Question 13

Stevens Law

Answer 13

Magnitude estimate

Question 14

What is Magnitude estimate?

Answer 14

Using rating scale to measure intensity (Very Subjective)

Question 15

What does Stevens Law allowed

Answer 15

Allows for cross model matching

Question 16

Process of action (pressing a button)

Answer 16

Retina
LGN (Lateral geniculate Nucleus)
V1 (first stage of cortical processing of visual info)
V2 (Second stage of cortical processing of visual info)
V3 (Third cortical area in the ventral stream)
Inferior temporal lobe
Prefrontal cortex
Premotor Cortex
Primary motor cortex
Spinal coded
Finger muscle

Question 17

Determining where processing is occurring

Answer 17

Behavioural task present stimuli and collect responser

functional pathways easier to identify then levels of pathways

Question 18

Teller (1980) theory

Answer 18

Localise the level where the response looks like the neural response
some levels provide a stringent bottleneck and nothing else can effect

Question 19

Whats an example of Teller (1980) theory

Answer 19

Visual acuity

Question 20

Whats the formula for Visual Acuity

Answer 20

@ = tan^-1 (target size/Distance to target)

Question 21

ø = MAR (what is MAR)

Answer 21

Minimum angle of resolution

1˚ = 60 minutes

Question 22

Eccentricity ?

Answer 22

Decline as target eccentricity increases

Question 23

Eccentricity Legend

Answer 23

Minimum angle of resolution as a function of a target distance from fixation

Question 24

Why does sensitivity vary with eccentricity ?

Answer 24

large gap between receptors

receptors sampling vary across the retina

Question 25

Does receptor spacing match the rate of change in the Acuity?

Answer 25

No, Anything after 2˚ the acuity falls faster than the change in cone density.