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Publication of "Principles of Psychology" (1890) - William James published his seminal textbook, introducing concepts like the stream of consciousness and the distinction between primary and secondary memory.

Development of the Wisconsin Card Sorting Test (1948) - David A. Grant and Esta A. Berg developed this neuropsychological test that measures executive function, specifically the ability to display flexibility in the face of changing schedules of reinforcement.

First Successful Deep Brain Stimulation for Parkinson's Disease (1987) - French neurosurgeon Alim Louis Benabid performed the first successful deep brain stimulation procedure to treat Parkinson's disease, a technique now used worldwide.