Signal Detection Theory
Psychology ⇒ Sensation and Perception
Signal Detection Theory starts at 11 and continues till grade 12.
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See sample questions for grade 11
A person is more likely to say 'yes' to detecting a signal when the cost of a miss is high. What does this indicate about their criterion?
A researcher wants to increase the sensitivity (d') of participants in a signal detection task. What should they do?
Describe a situation where a high false alarm rate might be acceptable.
Describe how changing the payoff matrix can influence an observer's criterion in a signal detection task.
A person is more likely to say 'yes' to detecting a signal when the cost of a miss is high. What does this indicate about their criterion?
A person is tested for their ability to detect a faint sound. Out of 100 trials, the sound is present in 50 trials. The person correctly detects the sound 40 times and says 'yes' when there is no sound 10 times. What is the hit rate?
A radiologist is examining an X-ray for signs of a tumor. According to Signal Detection Theory, what is it called if the radiologist says there is a tumor when there is none?
A researcher wants to increase the sensitivity (d') of participants in a signal detection task. What should they do?
Which of the following best describes a 'liberal' criterion? (1) Saying 'yes' only when certain (2) Saying 'yes' more often, even if unsure (3) Never saying 'yes' (4) Ignoring the signal
Which of the following best describes 'sensitivity' (d') in Signal Detection Theory? (1) The ability to distinguish signal from noise (2) The tendency to say 'yes' (3) The amount of noise present (4) The number of hits
Which of the following best describes the main advantage of Signal Detection Theory over simple threshold models? (1) It accounts for response bias (2) It ignores noise (3) It is easier to use (4) It only measures hits
Which of the following is a real-world example of a 'miss'? (1) A doctor fails to detect a disease that is present (2) A smoke alarm goes off when there is no fire (3) A person correctly ignores a non-existent phone ring (4) A student answers a question correctly
Fill in the blank: In Signal Detection Theory, a correct rejection occurs when ________.
Fill in the blank: In Signal Detection Theory, the ________ is the internal rule used to decide whether to say a signal is present or absent.
Fill in the blank: In Signal Detection Theory, the ________ rate is the proportion of times an observer says 'yes' when no signal is present.
Fill in the blank: In Signal Detection Theory, the tendency to say 'yes, I detected the signal' is called the ________.
True or False: A conservative criterion leads to more misses and fewer false alarms.
True or False: A high criterion means a person is more likely to say 'no, the signal is not present.'
True or False: In Signal Detection Theory, a 'miss' occurs when a signal is present but not detected.
True or False: Increasing the rewards for detecting a signal will likely lower the observer's criterion.
