 Repetition priming can occur without a person being aware of either the repeats or the improvements in his/her response, so it is generally thought to involve implicit memory processes that are dissociable from explicit memory processes.This idea has support from findings that amnesic patients with damage to limbic and/or diencephalic structures show measurable repetition priming effects but have deficits on explicit measures of memory.However, some researchers suggest that implicit and explicit memory systems are not in fact separate.