Psychophysicists define the difference threshold for a stimulus as the:
a. smallest difference in the magnitude of two stimuli that an observer can reliably detect
b. largest difference in the magnitude of two stimuli that an observer can reliably detect
c. amount of stimulus energy that must be present for the stimulus to be detected 50% of the time
d. amount of stimulus energy that must be present for the stimulus to be detected 100% of the time
A
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