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Memory research in psychology has significantly shaped our understanding of cognitive processes, with several landmark studies standing out for their profound impact. One of the most influential theories is the Multi-Store Model proposed by Richard Atkinson and Richard Shiffrin in 1968, which conceptualizes memory as comprising three distinct stores: sensory, short-term, and long-term memory. This model highlights how information transitions from one stage to another through rehearsal, aiding in its retention and retrieval. Another pivotal study is the 1959 experiment by Peterson and Peterson, which investigated the duration of short-term memory by assessing participants' recall of trigrams after varying time delays, underscoring the limited capacity and transient nature of short-term memory. Albert Bandura's 1963 Bobo Doll study, although primarily focused on aggression and social learning, also contributed to memory research by illustrating how observed behaviors are encoded and later recalled, integrating social cognitive theory into the understanding of memory processes. These studies collectively underscore the intricate mechanisms underlying memory, from encoding to retrieval, and have provided a foundation for ongoing research in cognitive psychology.