In a Psychophysical Experiment, Observers First View an Adapting Stimulus

In a psychophysical experiment, observers first view an adapting stimulus in which small dots on a computer screen all move steadily toward the right. They then view a test stimulus in which they have to determine whether a patch of dots is stationary or moving. Based on the textbook's discussion, one might predict that the adapting stimulus would:

A) decrease observers' absolute threshold for motion detection.
B) increase observers' absolute threshold for motion detection.
C) have little or no effect on observers' absolute threshold for motion detection.
D) decrease observers' difference threshold for motion detection.

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