Final answer:
Amnesiacs can rely on implicit memory, particularly procedural memory, to perform tasks without conscious recollection of previous experiences due to procedural learning being intact despite episodic or semantic memory loss.
Step-by-step explanation:
Amnesiacs can act on previous experiences without consciously remembering because of a type of memory known as implicit memory. This form of memory includes skills and routines that are acquired through procedural learning, which is typically preserved even when episodic memory (memory of specific events) and semantic memory (general knowledge) are impaired. A classic example is H.M., an individual with anterograde amnesia, who could not recall having done a puzzle before but showed improvement in solving it with repeated exposure. Implicit memories are learned and recalled without conscious awareness, operating in the background influencing behavior and cognition.