Researchers condition a flatworm to contract when exposed to light by repeatedly pairing the light with electric shock. The electric shock is a(n) primary conditioner. conditioned stimulus. secondary conditioner. unconditioned stimulus.
Based on the information provided within the question it can be said that in the researchers experiment the electric shock is being used as an unconditioned stimulus. This term refers to something that causes a natural and automatic response when introduced. This is usually combined with a conditioned stimulus (light) which after a while creates a conditioned response to a certain stimuli.
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