Mark was accidentally hit in the head with a baseball when younger. Now, whenever he sees anything flying nearby he dramatically jumps to avoid it, even if it is not coming in his direction. In this example, the original baseball that hit Mark in the head is considered a(n)

A. conditioned stimulus (CS).
B. unconditioned stimulus (UCS).
C. conditioned response (CR).
D. unconditioned response (UCR).


Answer: B

Psychology

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