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Scenario I
A psychologist interested in studying visual perception manipulates the brightness of a light in the imperceptible to very dim range.Each level of brightness (measured in lumens)is studied for 10 trials,and on each trial participants are asked if they can detect the light.Figure 4.1 shows hypothetical data from one participant.
Figure 4.1
-(Scenario I)This scenario is BEST described as research in the area of:
A)psychometrics.
B)perceptual constancy.
C)signal detection.
D)psychophysics.

Question

Use the following to answer questions 
Scenario I
A psychologist interested in studying visual perception manipulates the brightness of a light in the imperceptible to very dim range.Each level of brightness (measured in lumens)is studied for 10 trials,and on each trial participants are asked if they can detect the light.Figure 4.1 shows hypothetical data from one participant.
Figure 4.1 
-(Scenario I)This scenario is BEST described as research in the area of:
A)psychometrics. 
B)perceptual constancy. 
C)signal detection. 
D)psychophysics.

Quizplus · Accepted Answer

The scenario describes a study where a psychologist manipulates the brightness of a light (a physical stimulus) and measures its detection by participants. This falls under the area of psychophysics, which explores the relationship between physical stimuli and the subjective experiences they produce. Signal detection is a specific type of psychophysics that concerns detecting a signal (e.g., a faint light) in the presence of noise (e.g., background stimuli) and is relevant to this scenario. Psychometrics relates more broadly to the development and use of measurement tools in psychology, while perceptual constancy refers to the ability of the brain to perceive objects as stable despite changes in sensory input, which is not the focus of this scenario.

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