Consciousness Explained by Daniel Dennett

Context

Consciousness Explained, published in 1991 by Little, Brown, was Daniel Dennett's systematic attack on the mystery of consciousness and his most ambitious book. It appeared at the beginning of the "decade of the brain" and at the moment when the scientific study of consciousness was re-emerging after decades of behaviorist and computationalist neglect. Dennett's aim was nothing less than to explain consciousness — to show that the phenomena we call consciousness can be fully accounted for by the operations of the brain, without any residue of mystery.

The book's intellectual roots lie in the ordinary language philosophy of Gilbert Ryle, under whom Dennett studied at Oxford, and in the computational and evolutionary naturalism of his own earlier work. Ryle had attacked the "ghost in the machine"; Dennett attacks its modern descendant, what he calls the Cartesian Theater: the picture of consciousness as a central place in the brain where all information is assembled and presented to an inner observer. Against this picture, Dennett develops the multiple drafts model, in which the brain's activity consists of many parallel processes of content fixation, with no single, authoritative "finished" version of experience.

Core Arguments

Against the Cartesian Theater

The Cartesian Theater is Dennett's name for the family of views according to which there is a central locus of consciousness — a place where the brain's outputs are "presented" to a conscious self. Dennett argues that this picture is incoherent: it requires a homunculus (a little observer) inside the brain, and the homunculus would need its own theater, leading to an infinite regress. The picture also generates pseudo-problems, such as the "question of when information becomes conscious," which presupposes a single moment of presentation that never actually occurs. The book's central therapeutic task is to dissolve this picture.

The Multiple Drafts Model

Dennett's positive model is the multiple drafts model. The brain processes sensory information in parallel streams, and the contents of experience are determined by the competition among these streams — "drafts" of the ongoing narrative of experience — that are continually revised, edited, and updated. There is no single, definitive version of what happened; there are only the various drafts that exist at various times in various parts of the brain. Conscious experience is not a finished product presented to a spectator but a process of continuous editorial revision, in which the "winner" of the competition for influence over behavior determines what we report and remember.

The Timing Puzzle

Dennett uses ingenious thought experiments to show that the apparent temporal structure of consciousness is a construction. In the color phi phenomenon and the cutaneous "rabbit" illusion, subjects report experiences whose apparent timing cannot correspond to any literal sequence of neural events. Dennett's conclusion: the brain edits the timeline of experience after the fact, and the "stream of consciousness" is a retrospective construction. Questions like "at what exact moment did the experience occur?" are, he argues, ill-posed — they presuppose the Cartesian Theater.

Quining Qualia

The most controversial chapter, "Qualia Disqualified," argues that qualia — the intrinsic, ineffable qualities of experience — do not exist. Dennett's strategy is to show that every property philosophers have attributed to qualia is either incoherent or reducible to functional properties. He invites us to consider cases of inverted spectrum, changing tastes, and "experienced" colors, and argues that in each case the only coherent content is functional. The conclusion: the concept of qualia is a philosophers' invention, and the hard problem is a pseudo-problem.

Key Concepts

The book's key concepts — the Cartesian Theater, the multiple drafts model, heterophenomenology (treating subjects' reports as data to be interpreted, not as revelations of inner events), the "intentional stance," and the denial of qualia — have become standard tools in the philosophy of mind. Heterophenomenology is Dennett's methodological proposal for studying consciousness scientifically: take first-person reports seriously as reports, but interpret them in light of what the brain must be doing to produce them.

Legacy & Influence

Consciousness Explained is among the most influential and most controversial books in the modern philosophy of mind. It defined the "illusionist" or "deflationary" wing of consciousness studies — the view that consciousness, in the sense of irreducible subjective experience, does not exist or is not what it seems. The book provoked a generation of debate with dualists like David Chalmers, who called Dennett's position "the most implausible" theory of consciousness, and it has shaped the science of consciousness through its influence on researchers studying the temporal dynamics of experience and the neural bases of report. Although many philosophers reject its central claims, the book permanently changed the terms of the debate: after Dennett, no one could simply assume that consciousness is a phenomenon to be accommodated within the physical world; they had to argue for it.

Reading Guide

Consciousness Explained is written in Dennett's characteristically lively style and is accessible to a general audience, though its arguments repay careful study. The first half (Chapters 1–5) presents the critique of the Cartesian Theater and the multiple drafts model; the second half (Chapters 6–12) applies the model to perception, language, and the self. Readers new to the debate may find it helpful to read the answer pages on illusionism and the narrative self first. The book's central claims are defended more briefly in Dennett's paper "Quining Qualia."

Related Works

The book's naturalistic program is continued in Dennett's Kinds of Minds (1996), Freedom Evolves (2003), and From Bacteria to Bach and Back (2017). Its chief philosophical opponent is David Chalmers' The Conscious Mind (1996), and the debate is illuminated by Thomas Metzinger's Being No One (2003), which develops a middle position. The book's account of the self as a narrative construction connects to Michael Gazzaniga's split-brain research and to contemporary theories of the narrative self.