E Consciousness Taxonomy
E.1 Purpose
This appendix provides a structured classification of the types, levels, dimensions, and theories of consciousness referenced throughout the book. The goal is not to impose a final definition of consciousness, but to give readers a map of the major ways consciousness can be classified.
Because the book moves across philosophy, biology, neuroscience, artificial intelligence, origin-of-life studies, and consciousness-first frameworks, the word “consciousness” is used in several related but distinct ways. This taxonomy helps clarify those uses.
This taxonomy is especially useful because different theories often use the same word in different ways. For example, consciousness may mean subjective experience, access to information, self-awareness, biological sentience, cosmic mind, or a fundamental non-material reality such as T-Consciousness. A clear taxonomy helps prevent these meanings from being collapsed into one another.
E.2 Types of Consciousness
E.2.1 By Philosophical Category
| Type | Definition | Key theorists / frameworks |
|---|---|---|
| Phenomenal consciousness | Subjective experience; what it is like to see, feel, think, or exist from the first-person perspective | Nagel, Chalmers |
| Access consciousness | Information available for reasoning, report, decision-making, and behavioural control | Block, Baars, Dehaene |
| Self-consciousness | Awareness of oneself as a subject or as being aware | Rosenthal, higher-order theorists |
| Reflective consciousness | The capacity to think about one’s own thoughts, beliefs, identity, or experience | Higher-order theories, metacognition research |
| Pre-reflective consciousness | Immediate lived awareness before explicit self-reflection | Phenomenology, Merleau-Ponty |
| Minimal consciousness | Basic subjective awareness without complex self-reflection or language | Feinberg, Mallatt, minimal cognition debates |
| Proto-consciousness | A possible precursor or minimal form of experience below full consciousness | Panpsychism, basal cognition, some evolutionary theories |
| Sentience | The capacity for felt experience, especially pleasure, pain, suffering, or well-being | Bentham, Singer, animal ethics |
| Cosmic consciousness | Universe-level or reality-level consciousness from which individual minds may derive | Cosmopsychism, some contemplative traditions |
| T-Consciousness | Taheri’s proposed fundamental non-material consciousness reality that is not produced by matter, energy, frequency, or the brain | Mohammad Ali Taheri |
| Consciousness field | A proposed non-material field-like organizing reality through which consciousness relates to or manifests matter, life, and mind | Taheri’s T-Consciousness framework |
| Artificial consciousness | Possible consciousness in artificial systems such as AI, robots, or artificial life | Functionalism, AI consciousness debates |
This table shows that consciousness is not a single simple category. Some uses of the term refer to lived experience, while others refer to information access, self-reflection, sentience, cosmic awareness, artificial systems, or consciousness-first metaphysics.
E.3 By Biological Level
| Level | Examples | Evidence or argument | Status |
|---|---|---|---|
| Molecular | Chemical reactions, proteins, microtubules | Speculative claims in Orch-OR and some quantum mind theories | Highly speculative |
| Cellular | Single cells, immune cells, developmental bioelectric networks | Sensing, memory, self-regulation, adaptive response | Cognition plausible; consciousness uncertain |
| Unicellular organisms | Bacteria, protists, Paramecium, Stentor | Chemotaxis, habituation-like behaviour, decision-making, environmental responsiveness | Basal cognition; consciousness debated |
| Multicellular non-neural life | Plants, fungi, slime molds | Signaling, learning-like behaviour, network optimization, resource allocation | Intelligence debated; consciousness uncertain |
| Simple nervous systems | Cnidarians, jellyfish, hydra | Nerve nets, sensory response, coordinated movement | Possible minimal sentience; uncertain |
| Invertebrates | Insects, crustaceans, cephalopods | Learning, flexible behaviour, nociception, problem-solving, neural integration | Increasing evidence for sentience in some groups |
| Vertebrates | Fish, amphibians, reptiles, birds, mammals | Central nervous systems, learning, pain behaviour, affect, perception | Strong evidence for many forms of consciousness |
| Primates and humans | Apes and humans | Self-recognition, language, theory of mind, first-person reports | Strongest evidence |
| Artificial systems | AI, robots, artificial agents | Language, learning, self-modeling, goal-directed behaviour | Unknown and debated |
| Artificial life | Digital organisms, synthetic cells, life-like simulations | Evolution, adaptation, self-maintenance, reproduction-like processes | Life-like status debated; consciousness uncertain |
The biological taxonomy shows why the consciousness question becomes difficult at the lower levels of life. Evidence is strongest in humans and many vertebrates, increasingly plausible in some invertebrates, debated in plants and unicellular organisms, and highly speculative at the molecular level.
E.4 By Ontological Level
| Level | Description | Example theories |
|---|---|---|
| Brain-based consciousness | Consciousness exists only in organisms with suitable brains | Biological naturalism, GWT, RPT |
| Nervous-system consciousness | Consciousness requires nervous systems but not necessarily human-like brains | RPT, neurobiological theories, animal consciousness frameworks |
| Living-system consciousness | Consciousness or proto-consciousness may arise with living self-organization | FEP, autopoietic enactivism, co-emergence |
| Information-based consciousness | Consciousness depends on information integration or information architecture | IIT, computational theories |
| Function-based consciousness | Consciousness depends on functional organization, regardless of substrate | Functionalism, AST, GWT-inspired AI theories |
| Matter-based proto-consciousness | Matter has proto-conscious or experiential aspects | Panpsychism, Russellian monism |
| Cosmos-based consciousness | The universe as a whole is the primary conscious subject | Cosmopsychism |
| Consciousness-field ontology | Consciousness is a fundamental non-material reality expressed through consciousness fields | Taheri’s T-Consciousness framework |
| Mind-only ontology | Consciousness or mind is the only ultimate reality | Idealism, analytic idealism |
This table helps distinguish theories that locate consciousness in brains, nervous systems, life, information, function, matter, the cosmos, consciousness fields, or mind itself.
E.5 Levels and Dimensions
E.5.1 Graded Dimensions of Consciousness
| Dimension | Lower end | Higher end | Relevance |
|---|---|---|---|
| Wakefulness | Deep sleep, coma, anaesthesia | Alert waking state | Measures arousal, not necessarily awareness |
| Awareness | No apparent awareness | Rich phenomenal experience | Core dimension of consciousness |
| Sentience | No evidence of feeling | Pain, pleasure, suffering, well-being | Central for moral status |
| Self-awareness | No self-model | Reflective awareness of oneself as a subject | Important in humans and some animals |
| Bodily awareness | Minimal bodily regulation | Rich embodied self-experience | Links consciousness to life and organismic regulation |
| Temporal depth | Immediate reaction | Memory, anticipation, planning | Important for complex cognition |
| Intentional complexity | Simple world-directedness | Nested beliefs, theory of mind, symbolic thought | Important for higher cognition |
| Integration | Fragmented processing | Unified field of experience | Important in IIT, GWT, and neurobiological theories |
| Reportability | No report possible | Verbal or symbolic report | Useful but not identical to consciousness |
| Agency | Passive response | Flexible, self-directed action | Bridges life, cognition, and consciousness |
| Meaning | Bare signal response | Organism-relative significance and interpretation | Central to biosemiotics and co-emergence |
Consciousness is not only present or absent. It varies across dimensions such as wakefulness, awareness, selfhood, agency, integration, reportability, and meaning. This is why a graded model is often more useful than a simple yes-or-no model.
E.6 States of Consciousness
| State | Wakefulness | Awareness | Self-awareness | Notes |
|---|---|---|---|---|
| Deep sleep | Low | Low or absent | None | Usually low consciousness, though some dreaming may occur in sleep states |
| Dreaming | Low to moderate | Moderate to high | Variable | Rich experience can occur without ordinary waking control |
| Lucid dreaming | Low to moderate | High | High | Dreamer recognizes the dream state |
| Waking state | High | High | Variable to high | Ordinary conscious life |
| Flow state | High | High | Often reduced | Strong task absorption with reduced reflective self-consciousness |
| Meditation | Variable | Often high | Variable | May involve altered attention, selfhood, or awareness |
| Anaesthesia | Very low or absent | Absent or severely reduced | None | Used to study loss and recovery of consciousness |
| Coma | Very low or absent | None or minimal | None | Severe impairment of wakefulness and awareness |
| Vegetative state / unresponsive wakefulness | Wakefulness cycles may remain | No clear behavioural awareness | None apparent | Raises difficult diagnostic and ethical issues |
| Minimally conscious state | Variable | Partial or inconsistent | Limited | Some evidence of awareness remains |
| Locked-in syndrome | High | High | High | Consciousness preserved but motor output severely limited |
| Psychedelic states | High or altered | High and altered | Variable | May involve changes in self, perception, and meaning |
| Dissociative states | Variable | Variable | Altered | Self-experience and embodiment may fragment |
| Near-death experiences | Variable / medically complex | Reported as vivid by some individuals | Often high in reports | Interpretation remains debated |
States of consciousness show that wakefulness and awareness are not the same. A dreaming person may have vivid experience with reduced wakefulness, while a locked-in patient may have high awareness but little or no motor expression.
E.7 Theory Classification
E.7.1 By Ontological Commitment
| Category | Theories | Core claim | Relation to life-consciousness |
|---|---|---|---|
| Physicalist | GWT, RPT, AST, emergentism, many neuroscientific theories | Consciousness arises from physical processes | Life first |
| Biological naturalist | Searle, neurobiological theories | Consciousness is a biological phenomenon caused by brain processes | Life first |
| Functionalist | Computational functionalism, some AI consciousness theories | Consciousness depends on functional organization | Potentially substrate-independent |
| Informational | IIT, some information-based theories | Consciousness depends on integrated information or causal structure | Co-emergence or panpsychist implications |
| Enactive / autopoietic | Varela, Thompson, Di Paolo | Mind arises through living self-organization and embodied sense-making | Co-emergence |
| Panpsychist | Strawson, Goff, some readings of Russellian monism | Consciousness or proto-consciousness is fundamental and widespread | Consciousness first or co-emergence |
| Cosmopsychist | Shani, Nagasawa, Goff | The universe as a whole is conscious; individuals derive from it | Consciousness first |
| Idealist | Berkeley, Kastrup, analytic idealism | Consciousness is the only ultimate reality | Consciousness first |
| T-Consciousness framework | Taheri’s consciousness-field ontology | T-Consciousness is fundamental, non-material, and not produced by the brain | Consciousness first |
| Dualist | Substance dualism, property dualism | Mind and matter are distinct substances or properties | Separates life and consciousness |
| Neutral monist | Russell, James, some dual-aspect views | Mind and matter arise from a deeper neutral reality | Co-emergence |
| Dual-aspect monist | Spinoza, Pauli-Jung interpretations | One reality has mental and physical aspects | Co-emergence |
| Process philosophical | Whitehead | Reality is composed of processes or occasions of experience | Co-emergence or consciousness first |
| Quantum speculative | Orch-OR, Stapp, Fisher, Bohm-inspired theories | Consciousness involves quantum or deeper physical processes | Co-emergence or consciousness first |
This classification shows that theories of consciousness often differ less in evidence than in starting assumptions. A physicalist, an idealist, and a T-Consciousness theorist may all discuss consciousness, but they locate it at very different levels of reality.
E.8 By Mechanism
| Mechanism type | Theories | Key mechanism | Main question |
|---|---|---|---|
| Global access | GWT, Global Neuronal Workspace | Information broadcast across a cognitive system | Does access explain experience? |
| Recurrent processing | RPT, Edelman’s re-entry | Neural feedback loops | Is recurrence sufficient for consciousness? |
| Higher-order monitoring | Higher-order thought and perception theories | A mental state becomes conscious when represented by another state | Does consciousness require self-monitoring? |
| Attention modeling | AST | The system models its own attention | Does a model of awareness create awareness? |
| Information integration | IIT | Integrated causal information, Phi | Can consciousness be mathematically measured? |
| Predictive regulation | Predictive processing, FEP | Prediction-error minimization and active inference | Does prediction become experience? |
| Biological embodiment | Biological naturalism, Damasio, enactivism | Living bodies, affect, regulation, and neural processes | Does consciousness require life? |
| Self-production | Autopoiesis | The system continuously produces and maintains itself | Is life already proto-cognitive? |
| Semiotic meaning | Biosemiotics | Sign interpretation and biological meaning | Does life require meaning? |
| Quantum physical | Orch-OR, Stapp, Fisher | Quantum coherence, collapse, or measurement | Does quantum physics explain experience? |
| Consciousness-field organization | Taheri’s T-Consciousness framework | Non-material consciousness fields organize or manifest matter, life, and mind | Can this be connected to testable mechanisms? |
| Philosophical grounding | Panpsychism, idealism, cosmopsychism | Consciousness as fundamental reality | Does this explain or relocate the mystery? |
Mechanism-based classification is useful because some theories are scientific models while others are metaphysical frameworks. Global Workspace Theory, Recurrent Processing Theory, and Attention Schema Theory propose mechanisms inside cognitive systems. Idealism, panpsychism, and Taheri’s T-Consciousness framework begin from broader claims about the nature of reality.
E.9 By Relation to Life
| View | Life first? | Consciousness first? | Core interpretation |
|---|---|---|---|
| Strict life-first | Yes | No | Consciousness is a late product of biological evolution |
| Neural life-first | Yes | No | Consciousness appears only with nervous systems or brains |
| Biological naturalism | Yes | No | Consciousness is caused by biological brain processes |
| Co-emergence | Partly | Partly | Life and consciousness are deeply linked through self-organization and meaning |
| Autopoietic-enactive view | Life begins cognition | Not necessarily | Mind is rooted in living self-production |
| Panpsychism | No | Yes or always present | Consciousness or proto-consciousness is fundamental in matter |
| Cosmopsychism | No | Yes | Cosmic consciousness precedes individual life |
| Idealism | No | Yes | Life appears within consciousness |
| Taheri’s T-Consciousness framework | No | Yes | Life manifests through or within T-Consciousness and consciousness fields |
| Artificial consciousness functionalism | Not necessarily | No or depends | Consciousness may arise in non-living functional systems |
| Artificial life view | Artificial life may come first | Possibly | Consciousness may arise in life-like artificial systems |
This table directly connects the taxonomy to the central question of the book. Some theories place life before consciousness. Others place consciousness before life. Co-emergence views suggest that the relationship may not be strictly sequential.
E.10 By Evidence Type
| Evidence type | Most relevant to | Strength | Limitation |
|---|---|---|---|
| First-person report | Human consciousness | Direct access to reported experience | Limited to beings that can report |
| Behaviour | Animals, infants, AI, simple organisms | Widely applicable | Behaviour may be unconscious |
| Neural activity | Humans and animals with nervous systems | Strong correlation with conscious states | Correlation is not explanation |
| Brain stimulation / lesion evidence | Human and animal consciousness | Helps identify causal mechanisms | Mostly limited to nervous systems |
| Anaesthesia response | Humans, animals, some biological systems | Useful for studying loss of consciousness | Does not define consciousness by itself |
| Evolutionary continuity | Animal consciousness | Supports graded approaches | Does not identify exact thresholds |
| Basal cognition evidence | Simple organisms and plants | Shows intelligence-like life processes | Does not prove experience |
| Formal measures | IIT, computational theories | Provides precision | May not capture phenomenology |
| Artificial system behaviour | AI consciousness debates | Tests substrate independence | Intelligence may not equal sentience |
| Contemplative / phenomenological data | Human experience | Rich first-person detail | Hard to standardize |
| Ethical precaution | Animal and AI moral status | Useful under uncertainty | May overextend moral concern |
Different kinds of evidence answer different questions. First-person reports are powerful but limited to beings who can report. Behaviour is widely available but may not prove experience. Neural evidence is strong in animals with nervous systems but does not apply easily to plants, microbes, or artificial systems. Formal measures offer precision but may miss lived experience.
E.11 Summary of Main Taxonomic Distinctions
| Distinction | Meaning | Why it matters |
|---|---|---|
| Phenomenal vs access consciousness | Experience itself vs information available for use | A system may use information without experience |
| Cognition vs consciousness | Information processing vs subjective awareness | Simple organisms may be cognitive but not conscious |
| Sentience vs intelligence | Capacity to feel vs capacity to solve problems | Moral status depends more on sentience than intelligence |
| Self-awareness vs consciousness | Reflective self-model vs basic experience | Many beings may be conscious without reflective selfhood |
| Life vs mind | Biological organization vs experience or cognition | Central to the book’s main question |
| Simulation vs realization | Imitating a process vs actually instantiating it | Crucial for AI and artificial life |
| Weak vs strong emergence | Reducible higher-level pattern vs irreducible novelty | Central to emergentist theories |
| Matter-based vs consciousness-based ontology | Matter as primary vs consciousness as primary | Determines whether life or consciousness comes first |
| Bottom-up vs top-down explanation | Parts produce wholes vs wholes or fields constrain parts | Important in origin-of-life and consciousness-first models |
| Scientific vs metaphysical theory | Empirically testable model vs fundamental worldview | Important for evaluating testability |
| Consciousness field vs physical field | Non-material organizing reality vs measurable physical field | Important for placing T-Consciousness correctly |
E.12 Taxonomic Caution
This taxonomy should be read as a map, not a final theory. Different traditions divide consciousness in different ways. Some theories treat consciousness as neural access. Others treat it as subjective experience. Others treat it as integrated information, biological meaning, cosmic awareness, or a non-material consciousness field.
The same term may therefore have different meanings depending on context. For example, “consciousness” in Global Workspace Theory does not mean exactly the same thing as “consciousness” in idealism, panpsychism, or Taheri’s T-Consciousness framework. Similarly, “information” in Shannon theory, biology, IIT, and biosemiotics does not always mean the same thing.
The purpose of this taxonomy is to make these differences visible. It helps readers see that disagreement about consciousness is often not only disagreement about evidence. It is also disagreement about classification, definition, and metaphysical starting point.