Abstract

This article addresses the problem of evidence for Puccetti's hypothesis of normal dual consciousness, i.e., the hypothesis that a stream of consciousness flows in each cerebral hemisphere when both are functioning normally in intact, healthy people. Evidence counts as supportive only if it is not explainable by a certain close alternative hypothesis that holds consciousness to proceed in the nondominant hemisphere only when the dominant hemisphere is unable to inhibit it . From this perspective, I discuss two experiments involving anesthesia of the dominant hemisphere that were proposed, respectively, by Wilson and Puccetti, an actual experiment on normal, unanesthetized subjects reported by Landis, Graves, and Goodglass, as well as a further kind of experiment which, I suggest, may discriminate between the hypotheses. Assuming Puccetti is right, this experiment should yield a distinct pattern of reports from the dominant hemisphere about its experiences of acting as the individual deals with different kinds of tasks . Also considered is the common introspective evidence to the effect that we have only a single stream, never two distinct experiences at the same time. I argue, in support of Puccetti, that this is as it should be because introspection-at-a-distance is impossible; privileged access is internal to a stream, never occurs between streams