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David Chalmers is a central figure in the philosophy of mind who coined the 'Hard Problem of Consciousness' specifically to address the nature of qualia [1]. He argues that qualia cannot be fully explained by physical properties alone {fact:5, fact:11} and proposes that they represent the qualitative 'feels' of experience {fact:12, fact:15}.
Facts (19)
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The Hard Problem of Consciousness | Springer Nature Link link.springer.com 5 facts
claimDavid Chalmers defines consciousness as the phenomenal character of conscious states or qualia, which are aspects of reality that cannot be described in terms of physical properties.
claimDavid Chalmers characterizes 'direct phenomenal judgments' as having a double nature: they are both phenomenal events (experiencing qualia) and physical events (uttering thoughts about experience), which serves to bridge the phenomenal and physical realms.
claimDavid Chalmers argues that awareness is necessary to explain human knowledge of qualities, meaning the awareness problem is fundamentally linked to the subject problem of how consciousness or qualia result from a collective of smaller entities.
claimDavid Chalmers defines phenomenal qualities, or "qualia," as the qualitative feels or associated qualities of experience that make a mental state conscious.
claimDavid Chalmers identifies the problem of explaining phenomenal qualities (qualia) as the "hard part" of the mind-body problem.
David Chalmers - Wikipedia en.wikipedia.org 3 facts
claimDavid Chalmers proposes the existence of "psychophysical laws," which are lawlike rules that determine which physical systems are associated with specific types of qualia.
claimDavid Chalmers argues that if qualia, such as the perceived color of objects, were to fade or disappear, the holder of the brain would notice the difference, which would alter the brain's information processing and lead to a contradiction.
claimDavid Chalmers argues that because philosophical zombies are conceivable, they are logically possible, which implies that qualia and sentience are not fully explained by physical properties alone.
The Conscious Mind - Wikipedia en.wikipedia.org 2 facts
claimDavid Chalmers posits that information must only be phenomenally realized if it is physically realized, meaning an information system must be active to possess qualia.
claimDavid Chalmers identifies the question of why specific information corresponds to specific qualia rather than functionally equivalent qualia as an open question for a fundamental theory of consciousness.
Hard problem of consciousness - Wikipedia en.wikipedia.org 2 facts
quoteDehaene stated: "Once our intuitions are educated by cognitive neuroscience and computer simulations, Chalmers' hard problem will evaporate. The hypothetical concept of qualia, pure mental experience, detached from any information-processing role, will be viewed as a peculiar idea of the prescientific era, much like vitalism... [Just as science dispatched vitalism] the science of consciousness will keep eating away at the hard problem of consciousness until it vanishes."
claimIn his 2014 book 'Consciousness and the Brain', Dehaene rejected the concept of qualia and argued that David Chalmers' 'easy problems' of consciousness are actually the hard problems.
Moving Forward on the Problem of Consciousness - David Chalmers consc.net 1 fact
claimDavid Chalmers asserts that if neurons in a human brain were replaced with identically-functioning silicon chips, the subject would report that their qualia (conscious experience) remained unchanged.
Episode 2: The Hard Problem of Consciousness – David Chalmers ... futurepointdigital.substack.com 1 fact
perspectiveDavid Chalmers argues that third-person data cannot fully explain how or why qualia arise.
(DOC) The hard problem of consciousness & the phenomenological ... academia.edu 1 fact
claimElementary sensation is associated with specific qualia for each sense organ, whereas David Chalmers attributes neutral qualia to thoughts.
[PDF] The Hard Problem of Consciousness & The Progressivism of ... fds.duke.edu 1 fact
claimDavid Chalmers defines phenomenal consciousness as 'the hard problem' because qualia resists functional characterization.
Consciousness (Stanford Encyclopedia of Philosophy/Fall 2025 ... plato.stanford.edu 1 fact
perspectiveSome philosophers, such as Nagel (1974) and Chalmers (1996), argue that qualitative consciousness—the 'what it is like' aspect—is philosophically and scientifically central, and that organisms lacking such qualia may only be conscious in a loose or non-literal sense.
A harder problem of consciousness: reflections on a 50-year quest ... frontiersin.org 1 fact
claimDavid Chalmers coined the term 'Hard Problem of Consciousness' in 1995 to describe the question of why and how humans and other organisms possess qualia.
David Chalmers on the Hard Problem of Consciousness : r/philosophy reddit.com 1 fact
claimThe thought exercise discussed in the context of David Chalmers' work on the Hard Problem of Consciousness is designed to demonstrate that individuals could, in theory, behave like humans without possessing the qualia of consciousness.