In Clark's 1960 research with the clamworm (Nereis pelagica), repeated presentations of a shadow stimulus resulted in a continual decline in the worms' withdrawal escape response. Clark knew that the clamworms had habituated because
A) the clamworms' muscles had become fatigued.
B) the clamworms would still withdraw in response to being prodded.
C) the effects lasted for only a few seconds.
D) the clamworms' sense organs became adapted to the stimulus

Question

Quizplus · Accepted Answer

Clark concluded that the clamworms had habituated to the shadow stimulus because they still responded to a different stimulus (being prodded), indicating that the decline in response was not due to muscle fatigue or sensory adaptation, but rather a psychological process of learning to ignore the repeated, non-threatening stimulus.

In Clark's 1960 Research with the Clamworm (Nereis Pelagica), Repeated