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In an Experiment, the Pupils of Subjects' Eyes Contracted When

Question 113

Multiple Choice

In an experiment, the pupils of subjects' eyes contracted when a bright light was shown. After continual pairing of the bright light with the sound of a bell, subjects' pupils contracted when they heard the bell. After the pairing of the sound of the bell with the presentation of a black square, pupil contraction occurred with just the sight of the square. In this study, the unconditioned stimulus is (stimuli are) the ________.


A) light and square
B) bright light
C) square
D) bell and square

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