Signal Detection Theory
Psychology ⇒ Sensation and Perception
Signal Detection Theory starts at 11 and continues till grade 12.
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Define 'sensitivity' (d') in the context of Signal Detection Theory.
Describe how changing the criterion affects the rates of hits and false alarms.
Describe the main difference between Signal Detection Theory and classical threshold theory.
Describe what is meant by 'response bias' in Signal Detection Theory.
A radiologist is examining X-rays for signs of a tumor. Sometimes, the tumor is present, and sometimes it is not. If the radiologist says 'tumor present' when there is no tumor, what is this called? (1) Hit (2) Miss (3) False Alarm (4) Correct Rejection
Calculate the d' (sensitivity) if the z-score for the hit rate is 1.0 and the z-score for the false alarm rate is 0.0.
Explain how Signal Detection Theory can be applied to airport security screening.
Explain the significance of the area under the ROC curve in Signal Detection Theory.
A radiologist is examining X-rays for signs of a tumor. Sometimes, the tumor is present, and sometimes it is not. If the radiologist says 'tumor present' when there is no tumor, what is this called? (1) Hit (2) Miss (3) False Alarm (4) Correct Rejection
If an observer has a very strict criterion, which outcome is most likely to increase? (1) Hits (2) Misses (3) False Alarms (4) Sensitivity
If an observer's hit rate and false alarm rate are both 0.5, what is their sensitivity (d')? (1) High (2) Low (3) Zero (4) Cannot be determined
If an observer's hit rate is 0.85 and their false alarm rate is 0.15, what can you infer about their sensitivity? (1) High sensitivity (2) Low sensitivity (3) No sensitivity (4) Cannot be determined
Fill in the blank: A _______ occurs when the signal is absent and the observer correctly identifies that it is absent.
Fill in the blank: In Signal Detection Theory, the _______ is the probability of saying 'signal present' when the signal is actually present.
Fill in the blank: In Signal Detection Theory, the _______ refers to the observer's tendency to say 'yes, the signal is present' or 'no, the signal is absent.'
Fill in the blank: The _______ curve plots the relationship between the hit rate and the false alarm rate at various criterion levels.
True or False: A d' value of 0 indicates that the observer cannot distinguish between signal and noise.
True or False: A high sensitivity (d') means the observer can easily distinguish between signal and noise.
True or False: In Signal Detection Theory, a 'miss' occurs when a signal is present but not detected.
True or False: In Signal Detection Theory, increasing the payoff for hits will likely make the observer adopt a more liberal criterion.
