On the multiplicity of consciousness

Abstract

It is commonly assumed that where consciousness is present, it is a single stream. This notion is bolstered by functions attributed to consciousness, particularly providing multi-faceted experience of a perceptual scene and contributing to the production of coherent behavior, which supposedly require consciousness to be unitary. It is believed that were the unitary structure of consciousness to break down, such that multiple streams of consciousness are present, these functions would be compromised. The split-brain syndrome is widely regarded as evidence for this claim. However, the split-brain syndrome is an atypical structure of human consciousness. As such, conclusions based on the split-brain syndrome regarding the structure and functions of consciousness may be limited in generalizability. There may be cases where multiple consciousness is neither maladaptive nor anomalous but is the naturally evolved configuration, and thus may not compromise the capacity of consciousness to subserve multi-faceted experience and coherent behavior. This paper speculates on the different forms multiple consciousness may take, and demonstrates how they may be able to implement the aforementioned functions of consciousness. In doing so, the paper demonstrates that the commitment a unitary model of consciousness may be due more to anatomical constraints than functional ones.