Abstract

Shaffer takes a tour of some perennial questions in this lucid and simply written primer. How do I know I am not dreaming? How does reality differ from a dream? How can we be certain of our knowledge? Varying viewpoints are briefly summarized. The fallibilist view that even a priori mathematical truths and first person reports of feelings and perceptions are subject to error is examined, as is the anti-fallibilist reply that the theoretical possibility of error, without actual evidence, is not sufficient to disturb the certainty of certain kinds of knowledge. Our knowledge of the external world is questioned by Berkeleyan idealism, which treats matter as nothing but a perception of our minds, and by phenomenalism, which treats material objects as nothing but collections of sense data. Opposed to these views are causal theories, which view physical objects as existing independently of observers, and sense data as the result of the causal interaction of material objects and particular bodies. It should be noted that the book's format requires such drastic foreshortening of Descartes' and Berkeley's views that its characterization of the former's system as "one of the great achievements in man's intellectual history" is in no way confirmed by the textual references. Other questions discussed in lively fashion are the self ; identity theory ; epiphenomenalism ; and interactionism. Is the mind best defined as the collection of mental events one has during a lifetime? If these events are all connected with the same body, the mind seemingly cannot survive the death of the body. Finally, theistic and atheistic views about the meaning of life are compared, with the Aristotelian view of teleological causation as the common denominator. The book asks many questions, provides few answers, but serves as an enticement to further exploration.--A. T.