Researchers condition a flatworm to contract when exposed to light by repeatedly pairing the light with electric shock.The electric shock is a(n)
A) primary conditioner.
B) conditioned stimulus.
C) secondary conditioner.
D) unconditioned stimulus.

Question

Quizplus · Accepted Answer

The electric shock is the unconditioned stimulus because it naturally produces a reflexive response (contraction) without any prior conditioning.

Researchers Condition a Flatworm to Contract When Exposed to Light