Question 1

Which of the following best describes the main purpose of Signal Detection Theory (SDT) in psychology?

Accepted Answer

To differentiate between information-bearing patterns and random patterns in decision making under uncertainty.

Question 2

In SDT, what does the variable $$d' (d-$$prime) represent?

Accepted Answer

The perceptual sensitivity to distinguish signal from noise.

Question 3

A baseball umpire calls a pitch a 'strike' when it is outside the strike zone. According to SDT, this is an example of which outcome?

Accepted Answer

False Alarm

Question 4

If an expert driver has the same $$d' as a $$novice driver but a more lax criterion ($$\beta$$), what is the likely effect on their performance?

Accepted Answer

The expert will have more hits and more false alarms.

Question 5

Which equation correctly represents the calculation of $$d' in $$SDT, given the means ($$\mu_S$$, $$\mu_N) $$and standard deviation ($$\sigma) of $$the signal and noise distributions?

Accepted Answer

$$d' = \frac{\mu_S - \mu_N}{\sigma}$$

Question 6

In SDT, shifting the criterion ($$\beta) to $$the right (making it more strict) will result in which of the following?

Accepted Answer

Lower hit rate and lower false alarm rate.

Question 7

Which of the following is NOT a factor that can independently affect perceptual performance in SDT?

Accepted Answer

The time taken to make a decision

Question 8

A radar operator detects a target when only noise is present. What SDT outcome does this represent?

Accepted Answer

False Alarm

Question 9

Which of the following best explains why $$d'$$ and $$\beta$$ are measured separately in SDT?

Accepted Answer

Because they reflect independent influences on performance: sensitivity and decision criterion.

Question 10

In a scenario where weather conditions worsen while driving, which SDT variable is most likely to decrease?

Accepted Answer

Perceptual sensitivity ($$d')$$

Question 11

Which of the following is a correct pairing of SDT outcome and its definition?

Accepted Answer

Hit: Signal is present and observer correctly detects it.

Question 12

In SDT, what is the effect of increasing the rewards for correct detection and penalties for false alarms?

Accepted Answer

The observer's criterion ($$\beta) $$will likely become more strict.

Question 13

A novice driver is less likely to respond to a hazardous situation compared to an expert. According to SDT, this is most likely due to:

Accepted Answer

A stricter observer's criterion ($$\beta)$$

Question 14

Which of the following statements about SDT is TRUE?

Accepted Answer

The only thing you can control is the criterion ($$\beta$$), which can change with experience and bias.

Question 15

If the hit rate is 84% and the false alarm rate is 45%, what does this suggest about the observer's criterion ($$\beta$$)?

Accepted Answer

The criterion is lax (shifted left).

Question 16

Which SDT outcome is most analogous to a Type II error in statistics?

Accepted Answer

Miss

Question 17

In SDT, which variable is most directly influenced by the observer's expectancies and the rewards/penalties in a situation?

Accepted Answer

Observer's criterion ($$\beta)$$

Question 18

Which of the following real-world examples best illustrates the concept of 'noise' in SDT?

Accepted Answer

A radar operator mistaking a flock of birds for a plane.

Question 19

If $$d' is $$high, what can be inferred about the observer's ability to distinguish signal from noise?

Accepted Answer

The observer has excellent ability to distinguish signal from noise.

Question 20

Which of the following best describes the relationship between correct decisions and errors in SDT?

Accepted Answer

If one increases, the other decreases.

Signal Detection Theory in Perception: Behavioural Aspects

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