This document discusses primacy and recency effects in perception. It defines perception as how individuals organize and interpret sensory information to understand their environment. It then explains the stages of perception as stimulation, organization, interpretation, memory, and recall. Finally, it differentiates between the primacy effect, where first information received tends to form initial opinions and be better recalled, and the recency effect, where last information received dominates perception and is better recalled, especially if there is a delay between messages.