Transfer-Appropriate Processing

Transfer-Appropriate Processing is a term that implies that memories are most easily and efficiently stored and retrieved when the type of "processing" that the brain uses when the memory is first stored matches the processing used as the time of retrieval.

This is a fancy way of saying that memories are most easily retrieved when the individual is in the same state of mind as when the memory was first stored; happy memories are most easily retrieved when a person is happy, likewise sad or angry memories are most easily retrieved when in the same frame of mind.