Final answer:
Primacy is a memory bias that affects how we recall and perceive information, with first impressions or initial information often having the most lasting impacts.
Step-by-step explanation:
Primacy is a form of memory bias, and its lasting impacts illustrate the operation of constancy. This refers to the tendency for the first items presented in a series to be remembered more easily or to have a stronger impact on the person recalling them. This kind of bias is related to how our memory works and how initial information can influence our perceptions and opinions, creating a lasting impact. An example of this could be the first impressions formed when meeting someone new; those impressions tend to be more enduring than the ones formed later.