Answer:
Spontaneous recovery
Explanation:
An individual takes a sweat inducing injection in a dark room. This act of sweating is an Unconditional Response to the Unconditioned Stimuli which is the Injection.
After some time, whenever the individual is in a dark room, he begins to sweat. This is now a Conditioned Response (Sweating) to a Conditioned Stimuli(The Dark room).
If after some time, this conditional response lessons and goes away, it is referred to as Extinction.
However, after a period of absence, if the Conditioned Response returns, it is referred to as Spontaneous Recovery.
