Si la conscience est mathématiquement indépendante du substrat, qu'est-ce qui dicte les limites expérientielles strictes d'une identité individuelle sans l'ancrage physique d'un cerveau biologique ?

principle of individuation soul body Thomas Aquinas hylomorphism substantial form substrate

### Catholic-Thomistic Hylomorphism and Individuation In Roman Catholic theology, the nature of the human person is articulated through Aristotelian-Thomistic hylomorphism, canonized dogmatically at the Council of Vienne (1312), which defined the rational soul as *per se et essentialiter* the substantial form (*forma substantialis*) of the human body. Rooted in the synthesis of St. Thomas Aquinas (notably in *De Ente et Essentia*, c. 2, and *Summa Theologiae* I, qq. 75–76), this view rejects Cartesian mind-body substance dualism and physicalist reductionism. A human being is not an immaterial ghost driving a biological machine, but a single, unified composite of matter and form. #### Distinctive Terminology and the Principle of Individuation * **Substantial Form and Prime Matter:** While prime matter (*materia prima*) is pure potency devoid of actuality, substantial form actualizes it into a specific, living substance. The rational soul is the form that configures physical matter into an organic human body. * **Designated Matter (*Materia Quantitate Signata*):** Aquinas locates the principle of individuation not in the soul or universal form (which accounts for species-essence), but in "matter marked by quantity". Specific, spatio-temporally bounded matter individuates one human from another within the same species. * **Incomplete Substance:** The human soul is uniquely subsistent—capable of surviving biological death due to immaterial intellect and will. However, Aquinas insists that the separated soul (*anima separata*) is an incomplete substance. In his commentary on 1 Corinthians 15 (*Super I Cor.*, c. 15, lect. 2), Aquinas famously writes: *“Anima mea non est ego”* (“My soul is not I”). Complete personal identity requires bodily reconstitution. #### Lived Faith and Theological Tensions This framework underpins Catholic sacramental life and bodily practices: respect for the bodily remains of the dead, veneration of physical relics, and the expectation of the bodily resurrection rather than pure spiritual escape. Historically, this sparked deep Scholastic tensions. Franciscan thinkers, notably Blessed John Duns Scotus, rejected Aquinas’s *materia signata*, arguing that pure quantity cannot confer individuality; Scotus instead posited *haecceitas* (“thisness”), a unique, non-qualitative formal property individuating each entity. Within modern philosophy of mind, Thomistic hylomorphism is defended by contemporary analytic Thomists (e.g., Eleonore Stump, David Oderberg) as an alternative to Cartesian dualism and materialist identity theory. While modern neurobiology and cognitive science treat bodily-mental integration purely empirically without endorsing Scholastic metaphysics, Thomists maintain that hylomorphism best accords with embodied cognition without collapsing into mechanistic physicalism.

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Derek Parfit bundle theory personal identity substrate independence computationalism boundary problem

### Analytic Philosophy & Philosophy of Mind: Bundle Theory, Computationalism, and Personal Identity Within contemporary analytic philosophy of mind and metaphysics, the nature of the self is dominated by reductionist and functionalist frameworks. In *Reasons and Persons* (1984, Part III), Derek Parfit revived David Hume’s 18th-century **Bundle Theory** against the Cartesian "Ego Theory". Parfit argued that a person is not an irreducible, indivisible Cartesian substance or "further fact". Instead, personal identity consists entirely of more fundamental facts: physical events, interconnected mental states, and their causal relations. Through classic thought experiments—such as teletransportation and cerebral fission—Parfit famously concluded that **"identity is not what matters"** for survival. What matters is **Relation R**: psychological connectedness (overlapping memories, intentions, and traits) and continuity with the right kind of cause. Because Relation R can branch or exist by degrees, survival is not an all-or-nothing affair. For practitioners, this view undercuts rational egoism, dissolves fear of bodily death, and extends moral consideration across fragmented temporal selves and populations. This reductionism aligns naturally with **computational functionalism** (pioneered by Hilary Putnam in 1967) and the thesis of **substrate independence**: the claim that mental states supervene on causal and informational architecture rather than carbon-based biology. If mind is computational, psychological continuity can theoretically persist across silicon or simulated media. However, this intersection generates severe internal tensions: - **The Boundary Problem:** If minds are functional informational networks, what delineates the physical boundary of a single conscious observer? As Tomer Fekete and colleagues (2016) formalized in computational consciousness studies, functionalist models struggle to explain why complex systems do not spawn nested or overlapping sub-minds (the "nesting problem"). - **Biological Animalism:** Critics such as Eric Olson (*The Human Animal*, 1997) counter Parfit by arguing that human persons are essentially biological organisms, rejecting substrate independence and pure psychological continuity. **Epistemic Distinction:** While computational functionalism remains a central paradigm in cognitive science, the claim that consciousness is strictly **substrate-independent** (e.g., capable of running on digital hardware) remains an unproven theoretical hypothesis. Mainstream neurobiology currently treats conscious experience as dependent upon living biochemical neural processes, leaving artificial instantiation and digital mind-uploading as unresolved speculative physics and philosophy.

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Yogacara alayavijnana individual consciousness continuous stream without physical substrate anatman

### The Yogācāra Position: Consciousness as a Substrate-Free Continuum In Mahāyāna Yogācāra philosophy, consciousness does not depend on a physical substrate or an enduring soul (*ātman*). Instead, Yogācāra resolves the problem of personal continuity and karmic transmission across lifetimes under the core Buddhist doctrine of non-self (*anātman*) by defining consciousness as an uninterrupted, beginningless dynamic stream (*cittasantāna*). At the center of this framework is the **ālayavijñāna** (storehouse or substratum consciousness). Rather than a static, substantial warehouse, it is a flowing continuum of momentary psychophysical impressions. Every volitional act deposits latent impressions or "seeds" (*bīja*, *vāsanā*) into the *ālayavijñāna*, which subsequently ripen into future experience and rebirth. A secondary layer, the **kliṣṭamanas** (defiled mind), continuously observes this flow and reflexively misidentifies it as an autonomous, enduring "self" (*ātman*). Yogācāra practice centers on overcoming this error via deep meditative absorption (*samādhi*) and the realization of "representation-only" (*vijñaptimātra*), culminating in the "transformation of the basis" (*āśrayaparāvṛtti*), wherein karmic defilements cease and the continuum is transfigured into awakened awareness. ### Key Figures, Canonical Texts, and Quotations Systematized in fourth- to fifth-century India by the brothers **Asaṅga** and **Vasubandhu**, the doctrine draws primarily on two foundational texts: * **Saṃdhinirmocana Sūtra (V.7):** The Buddha describes this stratum while warning of its danger to those clinging to a self: > *"The appropriating consciousness is deep and subtle, all its seeds flowing like a river. Because it might incorrectly be conceived as a self, I have not taught it to the ignorant."* * **Vasubandhu’s Triṃśikākārikā (*Thirty Verses*):** In verse 4, Vasubandhu stresses that the *ālayavijñāna* is not a static soul: > *"It moves like the flow of a river torrent"* (*vartate srotasaughavat*), maintaining continuous causal conditioning until it ceases at liberation (*arhattve vyāvṛttiḥ*). ### Internal Tensions Classical Indian Yogācāra treats the *ālayavijñāna* as conditioned, impermanent, and fundamentally defiled—something to be dissolved upon awakening. Conversely, East Asian traditions and texts like the *Awakening of Faith in the Mahāyāna* synthesize the *ālayavijñāna* with **tathāgatagarbha** (Buddha-nature), debating whether the ground consciousness contains inherently luminous, unconditioned seeds alongside defiled ones. ### Epistemic Distinction While contemporary cognitive science and neurophenomenology (e.g., Francisco Varela, Evan Thompson) draw upon Buddhist models of the "stream of consciousness" to describe first-person phenomenology, **mainstream scientific and neurobiological consensus maintains that consciousness requires a physical substrate (the brain and central nervous system).** The Yogācāra claim of an independent, trans-death mental stream carrying latent seeds without physical embodiment is a metaphysical and soteriological doctrine, not an empirically verified scientific fact.

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biological basis of conscious boundary embodied cognition predictive processing self model Friston Seth

### Core Position of the Tradition Mainstream cognitive neuroscience increasingly rejects both classical Cartesian dualism and feedforward, stimulus-driven models of perception. Instead, it conceptualizes conscious selfhood as an active, embodied **generative model**. Under the predictive processing framework, the brain does not passively register the outside world; it acts as a Bayesian prediction engine that continuously projects top-down hypotheses against incoming sensory data, updating internal models only when discrepancies—**prediction errors**—force an adjustment. The felt boundary between "self" and "other" is not a static metaphysical barrier but a dynamic computational inference. Karl Friston formalizes this biological boundary using the concept of a **Markov blanket**—a statistical partition separating an organism’s internal states from external environmental states through bidirectional sensory inputs and active outputs. Organisms survive by minimizing **variational free energy** (a mathematical bound on informational entropy and surprising states), compelling them to anticipate environmental interactions and maintain homeostatic integrity via *active inference*. ### The Embodied Self and Interoceptive Inference Extending this to conscious presence, Anil Seth and Manos Tsakiris emphasize that selfhood is rooted in **interoceptive inference**—the top-down prediction and regulation of inner physiological states (such as visceral, respiratory, and cardiac signals), primarily coordinated by the anterior insular cortex. In *Being a Beast Machine: The Somatic Basis of Selfhood* (2018), Seth and Tsakiris argue that conscious experience evolved not for abstract cognition, but for allostatic regulation. As they formulate it, experiences of embodied selfhood arise *"because of, and not in spite of, our nature as 'beast machines'"*. Seth famously characterizes everyday conscious perception as a *"controlled hallucination"*—internal predictive models constrained by somatic and external error signals. When precision-weighting (the brain’s calibration of sensory reliability) fails, clinical disturbances like depersonalization, derealization, or psychosis emerge. ### Internal Branches and Epistemic Status A notable internal tension divides theorists regarding the boundaries of the mind: - **Internalist / Secluded views:** Figures like Jakob Hohwy (*The Predictive Mind*, 2013) emphasize that the brain remains functionally secluded behind its Markov blanket, reconstructing external reality through statistical inference. - **Embodied / Extended views:** Andy Clark (*Surfing Uncertainty*, 2016) and radical enactivists maintain that predictive processes are fundamentally spread across the dynamic coupling of brain, biological body, and environmental scaffolding. **Epistemic Clarification:** Unlike speculative or metaphysical frameworks (e.g., panpsychism, Integrated Information Theory's fundamentalist claims, or Penrose–Hameroff Orch-OR), embodied predictive processing is firmly tethered to laminar cortical neuroanatomy, autonomic physiology, and empirical behavioral paradigms. However, while predictive coding is widely accepted as a plausible mechanism in sensory and motor neuroscience, Friston’s overarching claim that the Free Energy Principle serves as an exhaustive, unified theory of life and conscious self-models remains actively debated and subject to ongoing empirical verification.

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Avicenna floating man argument individuation of nafs rational soul immaterial identity

In classical Islamic thought, the nature of human identity represents a fundamental divide between early *kalām* (rational theology) and Avicennian *falsafa* (philosophy). Classical Ash‘arite and Mu‘tazilite theologians viewed humans largely through an atomistic lens, treating the soul (*nafs* or *rūḥ*) not as an immaterial substance, but as an accident (*‘araḍ*) of physical life or a subtle body (*jism laṭīf*) dispersed within the coarse body. In sharp contrast, Ibn Sīnā (Avicenna, d. 1037) posited that the rational soul (*al-nafs al-nāṭiqa*) is a distinct, immaterial substance (*jawhar mujarrad*). To demonstrate this, Avicenna introduced the famous "Floating Man" (*al-insān al-mu‘allaq*) thought experiment in *Kitāb al-Shifāʾ* (*The Book of Healing: De Anima*, I.1) and later in *al-Ishārāt wa-l-Tanbīhāt*: > *"One of us must suppose that he was created all at once and perfectly formed, but that his sight is veiled from seeing external things, that he was created floating in the air or void... with limbs separated so they do not meet or touch... He would affirm the existence of his self without affirming that he has length, width, or depth... The self whose existence he affirms is therefore distinct from his body."* This thought experiment establishes direct, unmediated self-awareness (*shu‘ūr bi-l-dhāt*) independent of sensory data. A critical philosophical puzzle for Avicenna was the **individuation** (*tashakhkhuṣ*) of immaterial souls. Rejecting Platonic pre-existence and metempsychosis (*tanāsukh*), Avicenna argued that the soul originates alongside a specific, prepared body (*ḥudūth al-nafs ma‘a al-badan*). The specific corporeal temperament (*mizāj*) does not create the soul—the immaterial Active Intellect (*al-‘aql al-fa‘‘āl*) emanates it—but serves as the occasion that individuates it. Once brought into existence, the soul acquires unique moral dispositions (*malakāt*), intellectual forms, and memory traces, ensuring each soul preserves its individual identity and survives eternally after bodily dissolution. This Avicennian synthesis created lasting friction. In *Tahāfut al-Falāsifa* (*The Incoherence of the Philosophers*), Abū Ḥāmid al-Ghazālī (d. 1111) attacked the philosophers' claim that the soul's immateriality and post-mortem individuation could be demonstrated strictly through deductive reason rather than accepted via prophetic revelation, though later theologians (including al-Ghazālī and Fakhr al-Dīn al-Rāzī) incorporated substantial Avicennian psychology into mature *kalām*.

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Samkhya purusha prakriti linga sharira subtle body principle of individuation ahankara

### Core Metaphysics: Samkhya’s Dualism and Individuation Classical Sāṃkhya articulates an uncompromising ontological dualism between **Puruṣa** (unattached, plural, pure witness-consciousness) and **Prakṛti** (primordial, insentient nature governed by the three *guṇas*: sattva, rajas, and tamas). In the primary text of classical Sāṃkhya, Īśvarakṛṣṇa’s *Sāṃkhyakārikā* (c. 4th–5th century CE), experiential manifestation begins when Puruṣa reflects into Prakṛti, an association famously likened to a lame man with sight guiding a blind man who can walk (*paṅgv-andhavat*, *SK* 21). From this encounter evolves the intellect (*buddhi* / *mahat*), followed immediately by **ahaṅkāra**—the principle of individuation or "I-maker". As Īśvarakṛṣṇa states: > *"abhimāno 'haṅkāraḥ"* (*SK* 24; "Ego is the conceit of self-appropriation"). *Ahaṅkāra* generates empirical selfhood by falsely claiming agency ("I do," "this is mine"), projecting Puruṣa’s consciousness onto the unconscious cognitive mechanisms of matter. Together with *buddhi*, *ahaṅkāra*, the lower coordinator (*manas*), ten sensory-motor capacities (*indriyas*), and five subtle elements (*tanmātras*), it forms an 18-part subtle vehicle: the **liṅga-śarīra** (*SK* 40). This subtle body transmigrates across lifetimes, carrying karmic dispositions (*saṃskāras* / *bhāvas*), until discriminative discernment (*viveka-khyāti*) severs the illusion of identity, culminating in **kaivalya** (the solitary isolation and liberation of consciousness). ### Internal Branches and Tensions: Sāṃkhya vs. Nyāya While Sāṃkhya pairs pragmatically with Patañjali’s Yoga for meditative dis-identification, it faced fierce systematic debate from the realist **Nyāya** school (founded by Akṣapāda Gautama in the *Nyāyasūtra*, c. 2nd century CE): 1. **The Nature of Consciousness:** Sāṃkhya insists that Puruṣa *is* consciousness itself (*svarūpa-caitanya*). In contrast, Nyāya posits that the self (*ātman*) is an enduring substance (*dravya*), and consciousness is only an **adventitious quality** (*āgantuka-dharma*) produced when the ātman contacts the mind (*manas*), senses, and objects. 2. **Subtle Vehicle vs. Atomic Mind:** Nyāya rejects Sāṃkhya’s 18-fold *liṅga-śarīra* as ontologically bloated, holding instead that an all-pervading ātman transmigrates simply via its conjunction with a singular, indivisible atomic mind (*aṇu manas*). 3. **Liberation:** Consequently, while Sāṃkhya’s *kaivalya* is radiant, pure awareness, Nyāya’s release (**apavarga**) is a quality-less state of total cessation—devoid of pleasure, pain, and consciousness alike. ### Epistemic Note These systems reflect classical phenomenological and speculative metaphysical ontologies constructed for soteriological ends. Concepts such as the *liṅga-śarīra* or immaterial substances belong strictly to classical Indian philosophy; they should not be conflated with or mapped onto modern empirical neuroscience or physics.

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1 source from the original research is no longer reachable

Integrated Information Theory Tononi exclusion postulate experiential boundaries complex consciousness

### Speculative Theoretical Models: Integrated Information Theory (IIT) **Epistemic Status:** Integrated Information Theory (IIT) is a speculative, minority theoretical framework within consciousness science. It stands outside mainstream neuroscience consensus, which generally views subjective experience as an emergent computational or cognitive function. IIT’s ontological claim—that phenomenal experience is identical to maximally integrated cause-effect power—has drawn severe controversy, including an open letter in 2023 characterizing its core claims as untestable and pseudoscientific. Nonetheless, it remains an influential formal framework currently subjected to large-scale adversarial testing. #### Core Position and the Exclusion Postulate IIT was formulated by neuroscientist Giulio Tononi (initially in 2004, updated in landmark texts such as Tononi, 2012, and Oizumi, Albantakis, & Tononi, 2014) and championed alongside Christof Koch. The theory adopts a "consciousness-first" methodology: rather than searching for neural correlates of functions, it begins with self-evident axioms of phenomenology (existence, composition, information, integration, exclusion) and maps them to physical requirements (postulates). IIT explains experiential boundaries via the **exclusion postulate**. Phenomenologically, an experience is definite: it encompasses a specific repertoire of contents flowing at a specific temporal grain, neither fragmented into isolated sub-experiences nor diffused into an unbounded collective. Ontologically, the exclusion postulate dictates that *"only maxima of integrated information matter"*. Among overlapping candidate groupings of interacting mechanisms (such as neural circuits), only the single partition that achieves a local maximum of intrinsic, irreducible cause-effect power ($\Phi^{\max}$, quantified as *phi*) exists as conscious. This winner-take-all partition constitutes a **complex**. Any overlapping sub-networks or enclosing supersystems are strictly excluded from generating independent subjective experiences, thereby establishing the precise physical and spatio-temporal borders of a conscious entity. #### Operationalization and Landmark Studies Because calculating exact $\Phi$ for biological brains is mathematically intractable, clinical practitioners operationalize its principles using the **Perturbational Complexity Index (PCI)** (Casali et al., 2013). By perturbing the cortex with Transcranial Magnetic Stimulation (TMS) and measuring the algorithmic compressibility of resulting EEG waves, clinicians reliably differentiate vegetative states from minimally conscious patients. #### Internal Tensions Key theoretical tensions persist: 1. **Panpsychist implications:** IIT implies that simple physical architectures with feedback loops (e.g., 2D inactive grids) possess non-zero $\Phi$, implying ubiquitous non-biological consciousness. 2. **Empirical testability:** Recent empirical efforts, such as the multi-lab preregistered adversarial study by the Cogitate Consortium, yielded mixed results, supporting certain anatomical predictions in posterior cortical regions while challenging others.

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