Alan always turns the aquarium light on before putting fish food into the tank. After a while he notices that the fish swim to the top to look for the food as soon as he turns on the light. In this example, the __________ is the unconditioned stimulus (US).
A) tank
B) fish swimming to the top
C) fish food
D) aquarium light
Answer: C
Rationale: An unconditioned stimulus (US) is a stimulus that elicits a reflexive response without learning. In this example, fish would naturally swim to the surface in response to fish food. In contrast, the fish swim to the surface when the light is turned on only because it has a history of being paired with the food; this makes the light a conditioned stimulus (CS).
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