<P>Despite recent strides in neuroscience and psychology that have deepened understanding of the brain, consciousness remains one of the greatest philosophical and scientific puzzles. The second edition of <I>Theories of Consciousness: An Introduction and Assessment </I>provides a fresh and up-to-date introduction to a variety of approaches to consciousness, and contributes to the current lively debate about the nature of consciousness and whether a scientific understanding of it is possible.</P><P></P><P>After an initial overview of the status and prospects of physicalism in the face of the problem of consciousness, William Seager explores key themes from Descartes - the founder of the modern problem of consciousness. He then turns to the most important theories of consciousness:</P><P></P><UL><P><LI>identity theories and the generation problem</LI><LI>higher-order thought theories of consciousness</LI><LI>self-representational theories of consciousness</LI><LI>Daniel Dennett¿s theory