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The nervous system, I repeat, is double … I use the word brain to include the cerebral hemisphere and the subjacent motor and sensory tract. [Whereas] I use the word encephalon to include all parts of the nervous system within the skull.
Although some authorities have been reluctant to credit the disconnected minor hemisphere even with being conscious, it is our own interpretation based on a large number and variety of nonverbal tests, that the minor hemisphere is indeed a conscious system in its own right, perceiving, thinking, remembering, reasoning, willing, and emoting, all at a characteristically human level, and that both the left and the right hemisphere may be conscious simultaneously in different, even in mutually conflicting, mental experiences that run along in parallel.
It is a common observation that persons can have misperceptions, motivations, and even behaviors that we recognize but of which they seem unaware. This lends itself easily to what I call the naïve theory of “an other mind” (in each person so observed). This is not simply the “problem of other minds” (Churchland, 1984; Shorter, 1967) in that philosophers have often questioned the ascription of mind (including feelings and thoughts) to entities other than one's own self. The concept of “an other mind” not only takes for granted that each human has mind, including feelings, thoughts, memories, goals and intentions, but moreover claims that these exist in duplicate. Restated, it claims that within each person who is less than 100 percent insightful, there is goal-seeking, self-aware mentation beyond the mind each person readily acknowledges.