Integrated Information Theory of Consciousness: An Updated Account — Giulio Tononi — 2012

Tononi argues that consciousness exists when a system generates integrated information that is unified and irreducible. He proposes that experience is identical to this structure, explaining why some systems are conscious, how much consciousness they have, and what it is like.

1. What Consciousness Is (Experience + Axioms)

2. What Makes Consciousness Possible (Information, Integration, Causation)

3. How Consciousness Exists (Φ, Complexes, Structure)

4. Where Consciousness Exists (Boundaries, Limits, Scale)

5. How Consciousness Varies (Degrees Across Systems)

🧠 Conclusion

Giulio Tononi redefines consciousness at its core: it is not something the brain produces—it is the structure of integrated information itself. ⭐

What we call experience is identical to a system being unified, irreducible, and causally self-connected. ⭐

This shifts the question from “how does the brain generate consciousness?” to “which systems have the right structure to be conscious?” In doing so, the theory challenges earlier views like Global Workspace Theory, which focus on function and access, by arguing that consciousness is about intrinsic existence, not just what information does. ⭐

This reframing forces a deeper reconsideration of reality. If consciousness depends on Φ, then it may exist in degrees across different systems, raising questions about animals, artificial intelligence, and even non-biological structures. ⭐

But major questions remain unresolved.

  1. Can Φ truly be measured in complex systems like the human brain?
  2. Does the theory over-attribute consciousness to simple systems?
  3. And most importantly, does identifying structure fully explain why experience feels like something from the inside?

After IIT, consciousness is no longer just a biological feature—it becomes a fundamental property tied to how information exists in the universe. ⭐