Psychology · Consciousness · Self
The Feeling of Life Itself by Christof Koch — Summary, Key Ideas & Quotes
2019280 pages✦ 3-min Big ideas
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What is The Feeling of Life Itself about?
A thought-provoking argument that consciousness—more widespread than previously assumed—is the feeling of being alive, not a type of computation or a clever hack In The Feeling of Life Itself, Christof Koch offers a straightforward definition of consciousness as any subjective experience, from the most mundane to the most exalted—the feeling of being alive. Psychologists study which cognitive operations underpin a given conscious perception. Neuroscientists track the neural correlates of consciousness in the brain, the organ of the mind. But why the brain and not, say, the liver? How can the brain—three pounds of highly excitable matter, a piece of furniture in the universe, subject to the same laws of physics as any other piece—give rise to subjective experience? Koch argues that what is needed to answer these questions is a quantitative theory that starts with experience and proceeds to the brain. In The Feeling of Life Itself, Koch outlines such a theory, based on integrated information. Koch describes how the theory explains many facts about the neurology of consciousness and how it has been used to build a clinically useful consciousness meter. The theory predicts that many, and perhaps all, animals experience the sights and sounds of life; consciousness is much more widespread than conventionally assumed. Contrary to received wisdom, however, Koch argues that programmable computers will not have consciousness. Even a perfect software model of the brain is not conscious. Its simulation is fake consciousness. Consciousness is not a special type of computation—it is not a clever hack. Consciousness is about being.
A glimpse inside
Consciousness as Subjective Experience
Koch defines consciousness in the simplest terms: it is any subjective experience, from the taste of chocolate to the ache of loss. He rejects the idea that consciousness is merely a byproduct of computation or clever information processing. Instead, he roots it in the raw feeling of being alive, emphasizing that consciousness is not about what the brain does, but what it feels like to be a brain. This reframing shifts the debate from external behaviors to internal experience, making consciousness a fundamental aspect of reality rather than an emergent property.
Integrated Information Theory (IIT)
A central pillar of the book is Integrated Information Theory (IIT), which proposes that consciousness arises from the integration of information within a system. According to IIT, the more interconnected and unified a system's information processing, the richer its conscious experience. Koch explains how IIT quantifies consciousness with a value called 'Phi,' suggesting that consciousness can, in principle, be measured. This theory moves the study of consciousness from philosophical speculation toward empirical science, offering testable predictions and practical applications.
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6 key ideas, distilled
- 1Consciousness as Subjective Experience
- 2Integrated Information Theory (IIT)
- 3Consciousness Beyond Humans
- 4The Brain’s Unique Role
- 5Clinical and Technological Implications
Popular quotes from The Feeling of Life Itself
“Consciousness is the feeling of life itself—the feeling of being alive.”
Frequently asked
A thought-provoking argument that consciousness—more widespread than previously assumed—is the feeling of being alive, not a type of computation or a clever hack In The Feeling of Life Itself, Christof Koch offers a straightforward definition of consciousness as any subjective experience, from the most mundane to the most exalted—the feeling of being alive. Psychologists study which cognitive oper