The hierarchy is associated with the process of the evolution of organisms. The more basic animal has a superior sense of low-level memory and the more civilized creature has a superior of high-level memory. Such is the case with personal growth. As children grow up, procedural memory develops primarily and then the other memories develop in ascending order.
For example the atmosphere called childhood amnesia that has no memory at the age of three has delayed development of episodic memory. One has a superior sense of semantic memory before age 10 and then episodic memory gets an advantage. Conversely, the older one grows the more one gets forgetful because episodic memory declines (for example, senile dementia).
However, the mechanism of memory is different because memory has a hierarchy. For example the patients of anterograde amnesia can’t remember any new thing. As the result of clinical experiment, episodic memory and semantic memory is said to be closely related to the hippocampus above the mechanism of memory. The hippocampus integrates the information of the five senses and accumulates the memory of experiences (episodic memory). Memory remains in the hippocampus about a month and then moves to temporal lobe to be stored.
Short-term memory and priming memory are accumulated in cerebral cortex and procedural memory is accumulated in corpus striatum and cerebellum.
花村嘉英（2015）「从认知语言学的角度浅析鲁迅作品－魯迅をシナジーで読む」より translated by Yoshihisa Hanamura