Consciousness is one of the hardest to explain phenomena created by the human brain. We are familiar with the concept of what it means to be conscious. I am conscious and I admit that every other human being is also conscious. We become conscious when we wake up in the morning and remain conscious during waking hours, until we lose consciousness again when we go to sleep at night. There is an uninterrupted flow of consciousness that, with the exception of sleeping periods, connects who you are now with who you were many years ago.
Explaining exactly what consciousness is, however, is much more difficult. One of the best known, and popular, explanations was given by Descartes. Even though he was a materialistic, he balked when it came to consciousness, and proposed what is now known as Cartesian dualism, the idea that the mind and the brain are two different things. Descartes thought that the mind, the seat of conscience, has no physical substance while the body, controlled by the brain, is physical and follows the laws of physics
Descartes ideas imply a Cartesian theatre, a place where the brain exposes the input obtained by the senses, so that the mind (your inner I) can look at these inputs, make decisions, take actions, and feel emotions.
In what is probably one of the most comprehensive and convincing analyses of what consciousness is, Dennett pulls all the guns against the idea of the Cartesian Theather, and argues that consciousness can be explained by what he calls a “multiple drafts” model.
Instead of a Cartesian Theater, where conscious experience occurs, there are “various events of content-fixation occurring in various places at various times in the brain“. The brain is nothing more than a “bundle of semi-independent agencies“, created by evolution, that act mostly independently and in semi-automatic mode. Creating a consistent view, a serial history of the behaviors of these different agencies, is the role of consciousness. It misleads “us” into thinking that “we” are in charge while “we” are, mostly, reporters telling a story to ourselves and others.
His arguments, supported by extensive experimental and philosophical evidence, are convincing, well structured, and discussed at depth, with the help of Otto, a non-believer in the multiple drafts model. If Dennett does not fully explain the phenomenon of consciousness, he certainly does an excellent job at explaining it away. Definitely one book to read if you care about artificial intelligence, consciousness, and artificial minds.