The essential and most puzzling problem of consciousness is how the electro-chemical activity constantly occurring in the brain translates into the conscious experience we enjoy. Neither neuro-scientists nor psychologists nor philosophers have so much as tackled this problem head-on, (despite many claims to the contrary) let alone solved it. In this study, Errol Harris considers the attempts that have been made by several important neuro-scientists and philosophers to address the question, and he makes his own suggestions as to how it might be approached with the best prospect of intelligibility.