For example, Pablo Alvarez pointed to functional imaging studies which show different levels of activity in v1 during visualizing and imagining. The level of activity in higher-order visual areas remained the same whether subjects either saw or imagined an object. We also discussed the autobiographical aspect of memory. Moscovitch's account was mentioned in this respect. Valuation was pointed to as another crucial aspect of memory.
Memory is necessarily selective and selectivity is governed by relevance.
Arousal from the amygdala modulates both skill and declarative memory by stimulating the amygdala. There is a discrete emotional memory system, associated with arousal. However, the affective aspect of experience does play a role in all memory systems. Eichenbaum argued that these memory systems should not be confused. There are two ways to form a memory, by repetition and arousal.