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Exam 6: Psychophysics

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Question 21

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The most important control variable in a psychophysics experiment is

A) the stimulus magnitude.
B) the stimulus duration.
C) the participant's criterion.
D) the participant's ability.

E) B) and C)
F) A) and B)

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Question 22

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An ideal threshold would be a value of stimulus intensity such that stimulus intensities

A) above this threshold would always be detected.
B) below this threshold would always be detected.
C) equal to this threshold would never be detected.
D) above this threshold would never be detected.

E) C) and D)
F) B) and C)

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Question 23

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Imagine that you are designing an experiment to test the performance of your participants on detection of a difference in intensity of a stimulus near threshold under different conditions. You know that the detection threshold for each participant may be different. Describe the procedure you would use to determine the threshold for each participant.

Meteorologists are sometimes blamed for the bad weather they predict, even though they are not responsible for the weather. If a TV meteorologist is very concerned about the negative reaction of his audience to predictions of bad weather, what effect do you think this might have on his decision-making criterion? Explain your answer in terms of signal detection analysis.

There is rarely a perfect relationship between stimulus intensity and perceptual measures.

Describe how signal-detection theory alters the concept of a threshold held by classical psychophysicists.

Elaborate on the following statement, providing specific examples that support the statement: Psychophysics involves the determination of the psychological reaction to events that lie along a physical dimension.

The use of operational definitions allows other scientists to replicate your measurements.

Briefly describe the method of limits, and discuss the concept of absolute and relative threshold.

In psychophysical experiments, it is possible to generate the ROC function by changing the participant's decision criterion from conservative to liberal. The experimenter can change the decision criterion by

You are asked to decide if sugar is present in a cup of coffee. This is an example of a(n)

Scientists using psychophysical techniques were able to formulate the first mathematical laws of psychological phenomena.

The relationship between changes in an external stimulus and internal sensation is perfectly linear.

Give two examples for each of the four types of measurement scales. Explain why each is an example of that type of measurement scale.

Psychophysical experiments usually use largen designs.

Which of the following is not an example of an operational definition?

Which of the following is an acceptable operational definition for an auditory threshold?

A receiver-operating characteristic is often used to determine the scale of measurement to use.

The main thing that is controlled in a psychophysical experiment is the observer's strategy or frame of mind about his or her judgment.

In signal-detection theory, the criterion determines the hit rate, but not the false alarm rate.