Francis Crick, Neuroscientist

People know Francis Crick as the biologist who co-discovered the helical structure of DNA in the 1950's. However, he was also a physicist and a neuroscientist. In 1994 he published The Astonishing Hypothesis with, in my view, the misleading subtitle: "The scientific search for the soul". In fact, the book is about the study of human consciousness, a subject that has usually been the realm of psychologists and philosophers, but which Crick suggests should now be researched scientifically. What exactly was Crick implying?