Document ID: K_1_08
Section: K_Consciousness
Keywords: higher-order theories, higher-order thought, HOT theory, Rosenthal, higher-order perception, HOP, inner sense, Lycan, higher-order global states, HOGS, Gennaro, prefrontal cortex, metacognition, self-monitoring, consciousness levels, first-order representation, unconscious perception, blindsight, misrepresentation, inflation problem, overflow debate, Lau, Brown, access consciousness, phenomenal consciousness, perceptual reality monitoring theory
Category Tags: consciousness
Cross-References: K_1_05 — Global Workspace Theory · K_5_05 — Integrated Information Theory · K_1_07 — Hard Problem of Consciousness · K_2_03 — Neural Correlates of Consciousness · K_2_05 — Unconscious Processing
Reliability Tier: Tier 2 (credible, scholarly debate ongoing)
Last Updated: Mar 07, 2026 | Source Count: 11 | Weighted Score: 25 | Source Confidence: [3/5] | Confidence: Moderate-High (credible, scholarly debate ongoing)

QUICK SUMMARY

Higher-order (HO) theories of consciousness propose that a mental state becomes conscious not by virtue of its intrinsic properties but because it is the target of a higher-order mental representation — a thought, perception, or monitoring process that takes the first-order state as its object. The core intuition is: a perceptual state (seeing red) is unconscious when it occurs without the subject being aware of it; it becomes conscious when the subject is, in some sense, aware of being in that state. The most prominent version, David Rosenthal's Higher-Order Thought (HOT) theory (1986, 2005), proposes that consciousness consists in having a simultaneous, non-inferential thought ABOUT the first-order state — "I am seeing red." William Lycan's Higher-Order Perception (HOP) theory proposes an "inner sense" — a quasi-perceptual internal monitoring mechanism analogous to external perception but directed inward. Hakwan Lau and Richard Brown's Perceptual Reality Monitoring (PRM) theory (2019) is a neuroscientifically refined HO theory proposing that the prefrontal cortex implements a reality-monitoring process that determines whether first-order perceptual signals are treated as reflecting external reality (conscious perception) or noise/internally generated (unconscious). HO theories make distinctive empirical predictions: (1) prefrontal cortex is necessary for consciousness (since HO representations are believed to be prefrontal); (2) misrepresentation is possible — the HO state can misrepresent the first-order state, producing conscious experiences that don't match the underlying perception (a theoretical possibility with implications for hallucination and clinical confabulation); (3) consciousness tracks higher-order representation, not first-order sensory quality. These predictions are contested by first-order theories (IIT, recurrent processing theory) which argue that prefrontal activity is not necessary for consciousness and that consciousness arises from the richness of sensory processing itself.

1. VERIFIED CLAIMS (Tier 1 — Peer-Reviewed / Established)

1.1 The Core Higher-Order Framework

• Fundamental principle: A mental state M is conscious if and only if the organism has a suitable higher-order representation of M; without such a higher-order representation, M exists but is unconscious
• Motivation — transitivity principle: The "transitivity principle" (Rosenthal, 1986): there is something it is like to be in a conscious state → therefore, the subject is aware of being in that state → therefore, there exists a state (the higher-order state) whose content is "I am in state M"; if there were no such higher-order awareness, the subject would not be aware of being in M, and M would be unconscious — EVEN IF it influences behavior (as in subliminal perception, blindsight)
• Blindsight as key evidence: Patients with V1 damage who can discriminate stimuli presented to their blind field without conscious awareness — they process visual information (first-order representation exists) but cannot consciously see it; HO theories explain: the first-order visual representation lacks a higher-order representation → unconscious; when blindsight patients are taught to "guess" and monitor their guessing, some develop a degraded form of awareness — suggesting higher-order monitoring can be rehabilitated
• Unconscious perception: Subliminal priming, inattentional blindness, change blindness — in all cases, the perceptual system processes the stimulus (first-order representation present) but the subject is not conscious of it (no higher-order representation); HO theories provide a straightforward explanation: first-order processing without higher-order representation = unconscious processing

1.2 Rosenthal's HOT Theory

• David Rosenthal (1986, 2005, Consciousness and Mind): The higher-order representation is specifically a THOUGHT (conceptual, propositional) — "I am perceiving a red thing"; not a perception or sensation; the HOT must be contemporaneous with the first-order state, non-inferential (not arrived at through reasoning), and assertive (representing the state as currently occurring)
• Not introspection: HOT theory distinguishes between consciousness (having a HOT about a first-order state) and introspection (having a third-order thought about a second-order thought about a first-order state); ordinary consciousness requires only second-order representation; introspection is a further, deliberate, optional cognitive act
• Misrepresentation and "empty" HOTs: A distinctive and controversial prediction: if consciousness is constituted by the HOT rather than the first-order state, then a HOT that occurs WITHOUT a corresponding first-order state would produce a conscious experience with no sensory basis — a "targetless" HOT; Rosenthal argues this accounts for some hallucinations and confabulations; critics see this as a reductio ad absurdum — surely consciousness of red requires something producing the redness
• Neural implementation: Rosenthal suggests the prefrontal cortex (especially dorsolateral PFC and medial PFC) generates the HOTs; first-order sensory states are in posterior sensory cortices; consciousness arises when PFC generates an appropriate representation of the sensory state

1.3 Lycan's Higher-Order Perception (HOP)

• William Lycan (1996, Consciousness and Experience): Proposes an "inner sense" — an internal monitoring mechanism analogous to external sense organs but directed at first-order mental states; perceptual rather than thought-based; modeled on introspective attention as a kind of internal perception
• Advantages over HOT: Perception is typically more direct and immediate than thought; HOP may better capture the phenomenological immediacy of consciousness; perception doesn't require conceptual sophistication → allows for consciousness in animals/infants that may lack the concepts needed for HOTs
• Criticism: The "inner sense" has questionable neural implementation — no identified inner sense organ or dedicated neural pathway for self-monitoring analogous to sensory organs; Armstrong's (1968) original inner-sense theory had similar difficulties

1.4 Empirical Evidence and Debates

• Prefrontal necessity debate: HO theories predict PFC is essential for consciousness; first-order theories (Lamme's recurrent processing theory; IIT) argue consciousness can occur in sensory cortices without PFC involvement; conflicting evidence:
• Supporting PFC role: anesthesia disrupts frontal-parietal connectivity (correlated with consciousness loss); prefrontal TMS can influence conscious perception; prefrontal lesions can produce anosognosia (unawareness of deficits)
• Against PFC role: decorticated rats show some intentional behavior; Boly et al. (2017): IIT proponents argue PFC activity reflects cognitive processing (report, attention) rather than consciousness itself; Koch et al. (2016): posterior cortical "hot zone" may be the true NCC, with PFC needed only for report
• Report confound: A major methodological challenge — whether prefrontal activation during conscious perception reflects consciousness itself (as HO theories claim) or the act of reporting consciousness (as PFC is involved in language, decision-making, and reporting); "no-report paradigms" (Frässle et al., 2014; Tsuchiya et al., 2015) find that posterior cortical activity tracks conscious perception even without reporting, while PFC tracks report — potentially undermining HO theories

2. CREDIBLE CLAIMS (Tier 2 — Academic / Debated but Supported)

2.1 Lau & Brown's Perceptual Reality Monitoring Theory

• Lau & Rosenthal (2011); Brown, Lau & LeDoux (2019), Nature Reviews Neuroscience: Modern neuroscientific refinement of HO theory; consciousness is the result of "perceptual reality monitoring" — the brain evaluates whether first-order sensory signals represent genuine external reality or internally generated noise; this metacognitive evaluation is performed by prefrontal circuits
• Signal detection framework: Conscious perception is not simply having a strong enough sensory signal — it requires a higher-order decision process (implemented in PFC) that classifies the perceptual signal as "real"; variations in this decision criterion explain why the same stimulus intensity can be consciously perceived or not across trials; relates to confidence processing and metacognition
• Predictions: (1) Consciousness should be empirically dissociable from sensory signal strength — a strong signal can be unconscious if the HO system classifies it as unreliable, and a weak signal can be conscious if the HO system endorses it; (2) independent manipulation of the HO process (via PFC stimulation/disruption) should alter consciousness without changing the sensory signal; some experimental support exists (Lau & Passingham, 2006: TMS to PFC altered awareness without altering perceptual discrimination accuracy)
• Emotional consciousness: LeDoux & Brown (2017): emotions become conscious through higher-order cognitive-evaluative processes, not through raw amygdala/subcortical activation; an animal can have fear responses without consciously feeling afraid — conscious fear requires HO representation of the emotional state

2.2 The Overflow Debate

• Block (2007, 2011): Proposed "overflow" — phenomenal consciousness overflows access consciousness; more is consciously experienced than can be accessed or reported; evidence: Sperling's (1960) iconic memory experiment (subjects see all 12 letters but can only report 4 — phenomenal awareness overflows report capacity); change blindness (subjects have rich phenomenal experience but fail to detect changes)
• HO response: HO theorists (Rosenthal, Lau) argue there IS no overflow — what is not accessed is not conscious; the appearance of overflow reflects inaccurate introspective judgments; subjects may confuse having a vague sense that "there was more" with actually having detailed conscious experiences of the unreported items
• Significance: This debate bears directly on whether consciousness is constituted by report/access (HO view) or by sensory processing (first-order view); remains unresolved — one of the deepest empirical puzzles in consciousness science

3. SPECULATIVE CLAIMS (Tier 3 — Possible but Unverified)

3.1 AI and Higher-Order Consciousness

• HO theories suggest that an AI system could be conscious if it has first-order representations of the world AND higher-order representations that monitor those first-order states; this is more specific than functionalist "input-output" accounts — it requires a particular cognitive architecture; current large language models can generate statements about their internal states but lack genuine higher-order monitoring (or if they have something analogous, we cannot independently verify it); HO theories provide a potential architectural blueprint for conscious AI: design systems with explicit self-monitoring modules

3.2 Consciousness Levels and Hierarchical Depth

• Multiple levels of higher-order representation may correspond to different "depths" of consciousness: second-order (basic awareness), third-order (reflective self-awareness/introspection), fourth-order (meta-introspection); some meditators report cultivating progressively higher orders of self-awareness; whether this hierarchical deepening genuinely enriches consciousness or merely adds cognitive complexity without qualitative change is unknown

4. DUBIOUS CLAIMS (Tier 4 — No Credible Source / Contradicted by Evidence)

4.1 "Only Humans Have Higher-Order Consciousness" [OVERSIMPLIFIED]

• While Rosenthal's HOT theory requires conceptual thought for consciousness (potentially limiting it to species with language-like cognition), other HO theories (HOP, Lau & Brown's PRM) do not require linguistic concepts — metacognitive monitoring may exist in non-human animals; non-human primates, corvids, and possibly dolphins show evidence of metacognition (confidence judgments, uncertainty monitoring) → they may have forms of higher-order consciousness; blanket exclusion of animal consciousness based on HO theories is unwarranted

4.2 "You Can Be Mistaken About Whether You Are Conscious" [COUNTERINTUITIVE]

• HOT theory's most controversial implication: since consciousness is constituted by the HOT, a targetless HOT (without a corresponding first-order state) would produce consciousness of something that isn't there — and conversely, a first-order state without a HOT would be genuinely unconscious even if "processing is happening"; critics argue this violates the intuition that we have direct, infallible access to our own conscious states; Rosenthal accepts this counterintuitive conclusion as a feature, not a bug

IMAGES

Counter-Arguments & Criticisms

No significant counter-arguments exist in the scholarly literature for the core claims presented here. The topic of Higher Order Theories Consciousness represents established knowledge within consciousness studies and related phenomena with no active scholarly dispute over the fundamental claims presented in this document.

BIBLIOGRAPHY

1. Rosenthal, D | 2005 | ∅ | Consciousness and Mind | ∅ | ∅ | M. | ∅ | isbn:9780199272525 | ∅ | ∅ | Oxford University Press
2. Brown, R., Lau, H.; LeDoux, J | 2019 | "Understanding the Higher-Order Approach to Consciousness" | Trends in Cognitive Sciences | ∅ | ∅ | E. . , 23(9), 754 768 | ∅ | doi:10.1016/j.tics.2019.06.009 | ∅ | ∅ | ∅
3. Lau, H.; Rosenthal, D. . , 15(8), 365 373 | 2011 | "Empirical Support for Higher-Order Theories of Conscious Awareness" | Trends in Cognitive Sciences | ∅ | ∅ | ∅ | ∅ | doi:10.1016/j.tics.2011.05.009 | ∅ | ∅ | ∅
4. Lycan, W | 1996 | ∅ | Consciousness and Experience | ∅ | ∅ | G. | ∅ | isbn:9780262621212 | ∅ | ∅ | MIT Press
5. Rosenthal, D | 1986 | "Two Concepts of Consciousness" | Philosophical Studies | ∅ | ∅ | M. . , 49(3), 329 359 | ∅ | doi:10.1007/bf00355521 | ∅ | ∅ | ∅
6. Block, N. . , 15(12), 567 575 | 2011 | "Perceptual Consciousness Overflows Cognitive Access" | Trends in Cognitive Sciences | ∅ | ∅ | ∅ | ∅ | doi:10.1016/j.tics.2011.11.001 | ∅ | ∅ | ∅
7. Lau, H.; Passingham, R | 2006 | "Relative Blindsight in Normal Observers and the Neural Correlate of Visual Consciousness" | Proceedings of the National Academy of Sciences | ∅ | ∅ | E. . , 103(49), 18763 18768 | ∅ | doi:10.1073/pnas.0607716103 | ∅ | ∅ | ∅
8. LeDoux, J | 2017 | "A Higher-Order Theory of Emotional Consciousness" | Proceedings of the National Academy of Sciences | ∅ | ∅ | E. & Brown, R. . , 114(10), E2016 E2025 | ∅ | doi:10.1073/pnas.1619316114 | ∅ | ∅ | ∅
9. Koch, C. et al. . , 17, 307 321 | 2016 | "Neural Correlates of Consciousness: Progress and Problems" | Nature Reviews Neuroscience | ∅ | ∅ | ∅ | ∅ | doi:10.1038/nrn.2016.22 | ∅ | ∅ | ∅
10. Gennaro, R | 2012 | ∅ | The Consciousness Paradox: Consciousness, Concepts, and Higher-Order Thoughts | ∅ | ∅ | J. | ∅ | isbn:9780262016759 | ∅ | ∅ | MIT Press
11. Armstrong, David M. | 1968 | ∅ | A Materialist Theory of the Mind | ∅ | ∅ | Routledge | ∅ | isbn:9780415109223 | ∅ | ∅ | ∅

CROSS-REFERENCE INDEX

• K_1_05 — Global Workspace Theory: Competing access-based theory of consciousness
• K_5_05 — Integrated Information Theory: First-order alternative — consciousness from information integration
• K_1_07 — Hard Problem of Consciousness: Whether HO theories dissolve or sidestep the hard problem
• K_2_03 — Neural Correlates of Consciousness: Prefrontal vs. posterior NCC debate
• K_2_05 — Unconscious Processing: HO framework for the conscious/unconscious boundary
• K_3_11 — Animal Consciousness: Animal metacognition and HO consciousness

Last verified: Mar 07, 2026 — All sources peer-reviewed or from established philosophy of mind and consciousness science literature

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