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 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?
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.
Describe what is meant by 'criterion' in Signal Detection Theory.
Describe what is meant by 'noise' in the context of Signal Detection Theory.
Explain how Signal Detection Theory can be used to improve airport security screening.
Explain the difference between a 'miss' and a 'false alarm' in Signal Detection Theory.
Explain why Signal Detection Theory is important in understanding human perception.
If a person has a low sensitivity (d'), what does this mean about their ability to detect signals?
If an observer has a high rate of false alarms, what does this suggest about their response criterion?
If an observer's hit rate and false alarm rate are both high, what does this suggest about their criterion?
What does a 'hit' mean in Signal Detection Theory?
What is the main purpose of Signal Detection Theory in psychology?
