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

Question

Quizplus · Accepted Answer

The unconditioned stimulus is the bright light because it elicited the unconditioned response of pupil contraction without any prior conditioning. The other stimuli (bell and square) became conditioned stimuli through the process of classical conditioning.

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