Mind, Matter, and Meaning

Higher-Order Thought (HOT) Theories

Higher-order theories explain a mental state’s being conscious through an appropriate representation of that state. A first-order state concerns the world or body; a higher-order state concerns the subject’s being in a mental state. An unconscious perception and a conscious perception can therefore differ because only the latter is represented in the required higher-order way.

Higher-order thought (HOT) theory gives this representation a cognitive form. Other higher-order theories describe an inner perceptual monitor or a self-representational structure within a single state. These variants disagree about what kind of awareness is required and how it is organized.

The Explanatory Target

David Rosenthal distinguishes creature consciousness, such as being awake, from state consciousness, a mental state’s figuring in conscious experience. He also distinguishes being conscious of something from a state itself being conscious.

His transitivity principle connects the last two: a state is conscious when the subject is conscious of being in it in an appropriate way. This is a theoretical proposal about what makes states conscious, not merely an assertion that conscious people can sometimes introspect.

The proposal permits first-order sensory qualities in states that remain unconscious. The higher-order representation explains their subjective appearance to the person. Different accounts specify differently how first-order qualities and higher-order content determine what an experience feels like.

Actual Thoughts, Inner Sense, and Dispositions

In Rosenthal’s actualist HOT theory, the relevant thought is occurrent, assertoric, and apparently noninferential: it represents the subject as currently being in the state, rather than merely entertaining a possibility or inferring it from external evidence. The thought need not be verbally formulated, deliberately generated, or itself conscious.

Allowing an unconscious HOT avoids an immediate regress. If every consciousness-making thought had to be conscious, a further thought would be needed to make that thought conscious, and so on. Critics can still dispute whether an unconscious representation supplies the required awareness, but a regress does not follow simply from the word higher-order.

Higher-order perception theories, associated with Armstrong and Lycan, appeal instead to monitoring analogous to perception. Rosenthal argues that the relevant awareness need not have the sensory character such a model might suggest. Defenders of inner sense dispute this characterization of monitoring.

Dispositional HOT theories, associated with Peter Carruthers, appeal to availability for higher-order thought rather than requiring an actual separate HOT on every occasion. Availability can be understood as helping confer higher-order representational content on the first-order state. This is more specific than saying that any state that might later be noticed is already conscious.

Self-representational theories integrate awareness of the experience within its own structure. They belong to the wider debate but should not be treated as simply Rosenthal’s two-state account under another name.

Motivations and Evidence

Higher-order theories seek to explain differences between conscious and unconscious processing, apparent immediacy of self-awareness, and the connection between conscious experience and reports about it. Rosenthal also considers cases in which changes in qualitative concepts alter how experience is consciously discriminated.

The interpretation of these phenomena is contested. A first-order theorist may explain finer discrimination through attention or changes in the perceptual state, without a consciousness-making HOT. Correlations with metacognitive performance may reflect reporting or monitoring rather than experience itself. Experiments must distinguish those possibilities; verbal report provides evidence but cannot be assumed to settle the mechanism.

Mismatch and Targetless Representation

A higher-order representation might describe a first-order state incorrectly. It might even occur without the corresponding first-order target. If a HOT represents the subject as seeing red while the underlying state differs, which content determines the apparent experience?

Rosenthal allows that higher-order misrepresentation can shape subjective appearance, including in cases lacking the expected first-order target. Critics argue that this threatens the claim that a state becomes conscious by being represented: in a targetless case, no such target exists. Defenders distinguish the subject’s apparent experience from the actual qualities of the represented state. Other higher-order variants restrict or avoid targetless representations.

Rosenthal’s dental-fear example, in which a patient with destroyed dental nerves reports apparent pain amid fear and vibration, illustrates his interpretation of mental appearance, not a clinical demonstration that pain must be generated by a HOT. Expectation and bodily processing offer competing explanations.

Other Objections and Open Questions

Critics ask whether infants and animals possess the required concepts, whether the account demands overly sophisticated metacognition, and whether self-representation explains phenomenal character rather than only access or report. Defenders offer simpler forms of higher-order representation and argue that sophisticated linguistic self-description is unnecessary.

Higher-order theories can also coexist with accounts of first-order content and its environmental grounding. They are not inherently opposed to every representational theory, nor does representing an internal state automatically commit a theory to a private-object ontology. The central dispute concerns what makes an otherwise unconscious state consciously experienced.

Further Reading

  • Rosenthal, David M. 2009. “Higher-Order Theories of Consciousness.” In The Oxford Handbook of Philosophy of Mind. DOI: 10.1093/oxfordhb/9780199262618.003.0014.
  • Carruthers, Peter, and Rocco Gennaro. “Higher-Order Theories of Consciousness.” Stanford Encyclopedia of Philosophy. Revised January 9, 2026.
  • Intentionalism.md|Intentionalism — phenomenal character and representational content.
  • Transparency.md|Transparency — introspective attention to apparent worldly features.
  • Functionalism.md|Functionalism — causal-role approaches to mental capacities.
  • Qualia.md|Qualia — differing uses of experiential-quality terminology.
  • Mind, Matter, and Meaning — Gordon Swobe’s book presents the author’s argument about mind, consciousness, and meaning.