Jan N. Bremmer 
The Early Greek Concept of the Soul [PDF ebook] 

Jan Bremmer presents a provocative picture of the historical development of beliefs regarding the soul in ancient Greece. He argues that before Homer the Greeks distinguished between two types of soul, both identified with the individual: the free soul, which possessed no psychological attributes and was active only outside the body, as in dreams, swoons, and the afterlife; and the body soul, which endowed a person with life and consciousness. Gradually this concept of two kinds of souls was replaced by the idea of a single soul. In exploring Greek ideas of human souls as well as those of plants and animals, Bremmer illuminates an important stage in the genesis of the Greek mind.

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