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First Evidence of Sleep's Role in Memory Consolidation (1994) - Research demonstrated that sleep deprivation impairs learning and retention, establishing the critical relationship between sleep and memory formation.

Publication of the First Map of Neurotransmitter Pathways (1965) - Kjell Fuxe and Annica Dahlström published the first comprehensive mapping of monoamine neurotransmitter pathways in the brain, essential for understanding mood and cognition.