Full Idea
Alcmaeon apparently was the first Greek to assign central cognitive and biological functions to the brain.
Gist of Idea
Alcmaeon was the first to say the brain is central to thinking
Source
report of Alcmaeon (fragments/reports [c.490 BCE]) by Heinrich von Staden - Alcmaeon
Book Reference
'Encyclopedia of Classical Philosophy', ed/tr. Zeyl,Donald J. [Fitzroy Dearborn 1997], p.19
A Reaction
The name of Alcmaeon should be remembered with honour. This was 200 years before Aristotle, who still hadn't worked it out. I presume Alcmaeon inferred the truth from head injuries, which is overwhelming evidence, if you notice it.