Answer:
spontaneous recovery
Step-by-step explanation:
Spontaneous recovery: In psychology, the term "spontaneous recovery" is described as a phenomenon related to memory and learning which was proposed by a psychologist and behaviorist named Ivan Pavlov in his theory of classical conditioning that is also referred as Pavlovian conditioning.
According to Pavlov, spontaneous recovery referred to as the re-emergence of a specific formerly extinguished "conditioned response" after a particular delay in the conditioning process.
In the question above, the given statement is an example of spontaneous recovery.