Sn3le ot.ttchin.trea./ Group II Three subjects participated in a study in which

Question

Sn3le ot.ttchin.trea./ Group II Three subjects participated in a study in which they judged whether or not the letter M was presented in a background of visual noise. A total of 200 trials were run with the letter presented on half of the trials (100). Results for each of the three participants are shown below: Trial Type NOISE-ONLY NOISE+M Subject A Response 85 "NOISE ONLY"60 40 25 75 "NOISE+ M" Trial Type NOISE-ONLY NOISE+M Subject B Response "NOISE ONLY"80 "NOISE+ M" 20 80 20 Trial Type Subject C Response "NOISE ONLY" "NOISE+M NOISE-ONLY NOISE+M 80 20 40 60 Remember that Hit Rate is computed as the number of Hits divided by the total number of Signal + Noise trials (NOISE + M trials, in the current context) and False Alarm Rate is computed as the number of False Alarms divided by the total number of Noise-Only trials. Compare these three participants in terms of their ability to discriminate the Noise- only from the Noise+M states of world as measured by d'. Also compare them in terms of criterion, the tendency to respond "Signal+Noise" vs. "Noise-alone," as assessed by how mmore orre t Store Civi the war

Explanation / Answer

Subject A

There are 75 correct responses in the condition when when M was presented, and 25 wrong responses out of 100 trials.

So,

75/100= 0.75 is the hit rate

When the noise only trails were presented, noise plus M responses were 40. and correct responses were 60 out of 100 trials.

So,

40/100= 0.40 is the false alram rate.

Subject B

There are 80 correct responses in the condition when when M was presented, and 20 wrong responses out of 100 trials.

So,

80/100= 0.80 is the hit rate

When the noise only trails were presented, noise plus M responses were 20. and correct responses were 80 out of 100 trials.

So,

20/100= 0.20 is the false alram rate.

Subject C

There are 60 correct responses in the condition when when M was presented, and 40 wrong responses out of 100 trials.

So,

60/100= 0.60 is the hit rate

When the noise only trails were presented, noise plus M responses were 20. and correct responses were 80 out of 100 trials.

So,

20/100= 0.20 is the false alram rate.

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