The timeline of psychology spans centuries, with the earliest known mention of clinical depression in 1500 BCE on an ancient Egyptian manuscript known as the Ebers Papyrus.1 However, it was not until the 11th century that the Persian physician Avicenna attributed a connection between emotions and physical responses in a practice roughly dubbed "physiological psychology."

Some consider the 17th and 18th centuries the birth of modern psychology (largely characterized by the publication of William Battie's "Treatise on Madness" in 1758).2 Others consider the mid-19th century experiments done in Hermann von Helmholtz's lab to be the start of modern psychology.

Many say that 1879, when Wilhelm Wundt established the first experimental psychology lab, was the true beginning of psychology as we know it. From that moment forward, the study of psychology would continue to evolve as it does today. Highlighting that transformation were a number of important, landmark events.

Produce a timeline of key developments in the field of Psychology.