Consciousness — LessWrong Wiki
Summary: LessWrong’s wiki overview of consciousness — taxonomy of meanings, intellectual history from Democritus to Chalmers, and the rationalist community’s physicalist stance. Focal concern is “having experiences” and its implications for moral patienthood, personal identity, and AI welfare.
Sources: Raw/Consciousness — LessWrong.md
Last updated: 2026-05-07
Taxonomy of meanings
The word “consciousness” covers at least five distinct concepts:
- Wakefulness — awake vs. asleep/unconscious
- Having experiences — phenomenal consciousness; the focus of this page
- Knowledge/attention — “becoming conscious of” a fact
- Metacognition/reflective awareness — awareness of one’s own mental states
- Self-awareness — awareness of one’s own existence
The page focuses on (2) while acknowledging uncertainty about whether “having experiences” is coherent as a category separable from the others.
Why it matters
Three practical stakes drive interest in phenomenal consciousness (source: Consciousness — LessWrong.md):
- Moral patienthood: if experiences ground the moral weight of pain and pleasure, knowing which systems “have experiences” determines obligations toward animals, AIs, and emulations
- Personal identity: whether cryonic revival or whole-brain emulation produces me depends on whether the result has my experiences
- Anthropics: how many conscious observers exist determines prior probabilities in anthropic reasoning
Intellectual history (selected)
- Descartes (1641): mind-body dualism; the cogito; infallibility of introspection about one’s own experiences
- Leibniz (1714): the Mill argument — a machine big enough to enter and walk through would show only parts pushing each other, never a perception
- Peirce (1866): introduces qualia — what it is like to have a specific experience (redness, etc.)
- Nagel (1974): “What is it like to be a bat?” — subjective character of experience resists physical reduction
- Kirk (1974): philosophical zombies — beings physically identical to conscious persons but lacking experience
- Jackson (1982): Mary’s Room — knowing all physical facts about color doesn’t tell you what it is like to see red
- Chalmers (1996): formalizes the “hard problem”; distinguishes “easy problems” (how brain integrates information) from the hard problem (why any of this is experienced)
LessWrong community position
The community leans strongly physicalist. Yudkowsky argues p-zombies are incoherent: if consciousness has no causal effects, our claims about consciousness would have to be true by coincidence, which is Bayesianly absurd. Frankish (2016) proposes illusionism — the seeming irreducibility of qualia is itself a cognitive illusion.
The 2017 Muehlhauser report (Open Philanthropy) on consciousness and moral patienthood is the most substantial single treatment of these questions from within the community.
Connections to this wiki
This page is the most direct LW treatment of questions that run through llm-and-mind, borg-llm-meaning, and jaeger-relevance-realization. Borg’s distinction between derived and original intentionality maps onto whether LLMs “have experiences” in sense (2). Jaeger’s relevance realization attempts to specify, biologically, what genuine cognition requires. The honesty policy (taylor-ai-honesty-policy) explicitly assumes advanced AIs may have morally relevant preferences — a claim that depends on the consciousness question.