Signal detection theory

Question 1

Reciever operation curve

Answer 1

The curve has two distributions (A and B)

The criterion response is bar in the middle.

Overlap on the left side of the bar is MISS

Overlap on the right side of the bar is FA

D prime (d’ ) = the discriminability
Lots of overlap means low d prime,, little overlap means high d prime.

Question 2

Signal detection theory

Answer 2

Stimulus A versus B / Absent or Present generate different internal representations.

Observer gts an internal criterion, if the signal exceeds the criterion the observer says A, if its below B

Hit = saying A when there’s A
Miss = Saying B when there’s A
CR = Saying B when there’s B
FA = Saying A when there’s B

Can be plotted

Question 3

Very low decision criteria

Answer 3

High amount of hits but also high amount of false alarms

Question 4

Very high decision criteria

Answer 4

Low amount of Hits but also high correct rejections (and low false alarms)