Answer:
Spontaneous recovery
Step-by-step explanation:
Spontaneous recovery: In psychology, the term "spontaneous recovery" is described as one of the memory and learning phenomenon that was introduced by a psychologist named Ivan Pavlov in his theory of classical conditioning theory, and is referred to as the re-emergence or re-occurrence of a formerly extinguished "conditioned response" after some time or gap.
In the question above, the given statement represents spontaneous recovery.