Descartes' proof that his essence is thinking.--Thoughtless brutes.--Descartes' proof that he is essentially a non-material thing.--Behaviorism as a philosophy of psychology.--The privacy of experience.--Wittgenstein on the nature of mind.--The myth of cognitive processes and structures.--Moore and Wittgenstein on the sense of "I know."--The groundlessness of belief.

Assuming that the qualities of immediate experience ('sentience') are the subjective aspect of the neurophysiological cerebral processes, And assuming that all behavior is ultimately susceptible to physical explanation, There are a number of ways in which mind-Body monism can be stated. But there are also a number of serious difficulties for a logically coherent formulation of the identity thesis of the mental and the physical.