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Consciousness, mind, brain, self: the relations among these four entities are explored by German cognitive scientist and theoretical philosopher Metzinger, who argues that, in fact, "there is no such thing as a self." In prose accessible mainly to those schooled in philosophy and science, Metzinger defines the ego as the phenomenal self, which knows the world experientially as it "subjectively appear[s] to you." But neuroscientific experiments have demonstrated, among other things, that the unitary sense of self is a subjective representation: for instance, one can be fooled into feeling sensations in a detached artificial arm. So the author argues that the ego is a "tunnel" that bores into reality and limits what you can see, hear, smell and feel. Metzinger tests his theory by ranging over events of the consciousness such as out-of-body experiences, lucid dreaming and free will, and he concludes by probing ethical actions and what a good state of consciousness would look like. Most readers will have difficulty penetrating Metzinger's ideas, and those who do will find little that is genuinely new. (Apr.)Copyright © Reed Business Information, a division of Reed Elsevier Inc. All rights reserved.