Publication of Luigi Galvani's Treatise (1791) - Italian physician Luigi Galvani published his findings on "animal electricity," demonstrating that nerve cells conduct electricity. This groundbreaking work laid the foundation for modern neuroscience and electrophysiology.
First Description of "Dendritic Spines" (1888) - Spanish neuroscientist Santiago Ramón y Cajal published his first detailed observations of dendritic spines, the tiny protrusions on nerve cells now known to be crucial for memory formation.
Publication of Donald Hebb's "The Organization of Behavior" (1949) - Hebb introduced his revolutionary theory of neural plasticity and learning, now known as Hebbian theory, summarized by the phrase "neurons that fire together, wire together."