This is the best non-fiction book that I have ever read and that's saying something, as I am an avid reader of all genres; having read other books on the same subject, including those of Colin Wilson, who wrote the foreword here, I have to say that this book is the best and most lucid that I have come across.
What a great book bringing together many of the thoughts of the great minds who have applied them to the task of really trying to define what actually human consciousness is; even whether it CAN actually be defined and described.
Lachman's book is erudite, easy to read even when, of necessity, he has been obliged to use some of the more esoteric terms from psychiatry and those coined by various different thinkers, etc. In fact, all-in-all, this book is a great undertaking just in the way it is put together, flowing easily on from one concept into another, never mind the excellent, lucid explanations.
He occasionally introduces his own very worthy thoughts on the various ideas and often remarks about the similarity of thought which does, in fact, run throughout the book, thus making one aware that some of these great thinkers have thought along the same lines, which makes me, at least, think that they do definitely have a grasp on, or perhaps, for want of a better phrase, are on the outskirts of this undoubtedly notoriously difficult to define subject.
Anyone who has ever wondered about the human mind and consciousness in general should read this book and find out what others over the past couple of hundred years or so have to say; as the other reviewer remarked, it has spurred him on to obtain the writings of many of the thinkers mentioned - the very same applies to me, which is why I think so highly of Lachman's great book.
In any event, this book is VERY HIGHLY RECOMMENDED.