The author makes the claim that a cerebral type must have a large head/brain and a disproportionately small, frail body. This physical structure is said to be the cause of the behaviors peculiar to the type. Yet all of the behaviors are exact peculiarities of myself and I do not fit the physical description of the type! I have a small head on a small frame. So how is that possible? The logic of this book fails. It falls into superficial generalities which fail the test of reality. If I happened to have a big head on a small body I would probably think this book was great and so very accurate, but fortunately I have a smaller head and can as a consequence comprehend that this book makes false claims.