When James Braid introduced the concept of hypnotism, he was not consistent with his proposal. At one time he spoke of hypnotism as a specific sleep-like neurological state comparable to animal hibernation or yogic meditation and at other times he spoke of it as encompassing a number of different stages or states that are an extension of ordinary psychological and physiological process. Braid seems to have moved from a more "specific state” understanding to a more complex "non-state” orientation.