P.8, Pb.1102 points for each question) An experiment is conducted that measures

Question

P.8, Pb.1102 points for each question) An experiment is conducted that measures sensitivity to a weak signal. On each trial the signal is either present (signal trials) or absent (noise trials), and the subject must respond present" or "absent: Please use Signal detection theory, to . o (1) Fill in the missing values in the following table (2 points): (2) Calculate P(hit). PIMissing), P(False Alarms), and P (Correct Reject) for both subjects (4 points)l: e (3) Which subject is using a relative liberal threshold (1point)? Subject A Subject 8 Responses Responses Stimulus Present Absent Present Absent Signal 60 90 eos 40 Noise 90

Explanation / Answer

Subject A Subject B Responses Responses Stimulus Present Absent Stimulus Present Absent Signal 60 40 100 Signal 90 10 100 Noise 10 90 100 Noise 60 40 100 70 130 150 50 Since in both cases, the row of stimulus (Signal & Noise) should add up to 100 Subject A Subject B P(hit) 60/100 0.6 P(hit) 90/100 0.9 P(Miss) 40/100 0.4 P(Miss) 10/100 0.1 P(False Alarm) 10/100 0.1 P(False Alarm) 60/100 0.6 P(Correct Reject) 90/100 0.9 P(Correct Reject) 40/100 0.4 P(Accuracy) (60+90)/200 0.75 P(Accuracy) (90+40)/200 0.65 Since accuracy of Subject B is poorer, it must be using a liberal threshold

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