Tim Bayne

This is a review of Barry Dainton's ‘Stream of Consciousness’. While much that is written about the unity of consciousness does, as Dainton says, traffic in vague metaphors and exaggerated claims, Dainton's book is a superb example of sober thinking and meticulous attention to detail. Stream of Consciousness can be roughly divided into three projects, projects that are bound together by co-consciousness. In the present context ‘co-consciousness’ refers to the relation that experiences have when they are experienced together. For instance, when one experiences a pain in one's foot while listening to music, these two experiences will typically be co-conscious parts of a single multi-modal experience, feeling-a-pain-in-one's-foot-while-listening-to-music.

According to conventional wisdom, the split-brain syndrome puts paid to the thesis that consciousness is necessarily unified. The aim of this paper is to challenge that view. I argue both that disunity models of the split-brain are highly problematic, and that there is much to recommend a model of the split-brain—the switch model—according to which split-brain patients retain a fully unified consciousness at all times. Although the task of examining the unity of consciousness through the lens of the split-brain syndrome is not a new one—such projects date back to Nagel’s seminal paper on the topic—the time is ripe for a re-evaluation of the issues.