Le soi est-il continu à travers le temps ?

Buddhist doctrine of momentariness and the problem of personal continuity in the Abhidharmakosa

The Buddhist doctrine of universal momentariness (*kṣaṇavāda*) asserts that all conditioned phenomena (*dharmas*) exist only for a single, fleeting instant before passing away. While this radical impermanence aligns with the fundamental Buddhist rejection of a permanent self or soul (*ātman*), it creates a profound philosophical problem: if the mind and body are dissolving and regenerating at every moment, how can one account for personal continuity, memory, and the fruition of karma over time? This dilemma is a central focus of Vasubandhu’s monumental text, the *Abhidharmakośa* (and its autocommentary, the *Bhāṣya*). In the text, Vasubandhu staunchly defends the orthodox doctrine against the *Pudgalavādins* (Personalists), a rival Buddhist sect who argued that functions like memory require a persistent, real "person" (*pudgala*) to experience and accumulate them. Vasubandhu rejects the need for any static essence. Instead, he solves the problem of personal continuity through the concept of *saṃtāna* (a dynamic continuum or "mind-stream"). According to this framework, an individual is not an enduring substance but an unbroken chain of causally connected moments. Personal continuity is maintained simply by the "continuous, moment-to-moment evanescence and dissolution of the five skandhas [aggregates] in the saṃtāna". To explain how karmic effects and memories bridge temporal gaps within this flux, Vasubandhu integrates the Sautrāntika theory of *bīja* (seeds)—latent karmic potentialities planted in the mental continuum that eventually ripen and bear fruit without requiring a permanent owner. Ultimately, the Abhidharma tradition defines the person purely through causal efficacy across time rather than ontological endurance. Embracing this paradox of survival without a survivor, Abhidharma theorists assert the dynamic reality of the continuum, concluding that "what we are in one moment is not what we are the next".

• stanford.edu
• grokipedia.com
• scribd.com
• ntu.edu.tw
• academia.edu

Advaita Vedanta concept of Sakshi or witness consciousness as the invariant subject through time

In the tradition of Advaita Vedanta, *Sakshi* (witness consciousness) is understood as the ultimate, invariant subject that remains continuous and unmodified through the passage of time and all changing phenomena. It is not a localized ego or an individual mind (*jiva*), but rather the non-dual, impersonal ground of pure awareness. **Position and Key Concepts** Advaita asserts that while the physical body and mental states—known as *vrittis* (mental modifications)—are bound by time and subject to constant flux, the *Sakshi* remains the timeless, unmoving observer. This is frequently explored through the analytical method of *Drg Drisya Viveka* (seer-seen discrimination), which demonstrates that the true observer can never be an object of perception; the "seer" is logically distinct from everything that is "seen". Because *Sakshi* transcends temporal states, it persists even when mental activity ceases. Vedanta points to *sushupti* (deep, dreamless sleep) as proof of this invariant subjectivity: although there are no objects or dualities to observe in deep sleep, the witness consciousness remains present, which allows one to wake up and retrospectively report, "I slept well, I knew nothing". This unbroken continuity across waking, dreaming, and deep sleep is termed *Turiya* (the fourth)—an unchanging substrate of pure witnessing awareness. **Key Figures and Texts** The 8th-century philosopher Adi Shankara formalized this framework, using Upanishadic teachings to differentiate the eternal *Sakshi* from the transient mind. Modern exponents like Swami Sarvapriyananda and Swami Vivekananda have heavily popularized these teachings to address the "hard problem of consciousness" in a contemporary context. The foundational authority for *Sakshi* rests in the Upanishads. Describing the eternal, unobjectifiable nature of this invariant subject, the *Brihadaranyaka Upanishad* (4.3.23) famously declares: “This self is that which has been described as 'not this, not this.' It is imperceptible, for it is never perceived; undecaying, for it never decays; unattached, for it never attaches”. Ultimately, *Sakshi* is employed as a pedagogical device to help practitioners shed identification with the temporal body-mind complex. Once this duality is transcended, the "witness" collapses into pure, undivided *Atman* or *Brahman*.

• researchgate.net
• researchgate.net
• reddit.com
• advaita-vision.org
• medium.com
• reddit.com
• advaita-vision.org

Derek Parfit psychological continuity theory vs the ego theory of personal identity

In analytic philosophy of mind, the debate over personal identity over time often contrasts the intuitive **Ego Theory** with Derek Parfit’s reductionist **Psychological Continuity Theory** (a modern variant of the Bundle Theory). Parfit's 1984 magnum opus, *Reasons and Persons*, serves as the foundational text for this discourse, arguing that our ordinary, deeply held beliefs about surviving as a single, indivisible "self" are fundamentally mistaken. According to the **Ego Theory**, a person's continued existence over time can only be explained by the persistence of a distinct, unified subject of experience—typically conceived as a "Cartesian Pure Ego, or spiritual substance". In this non-reductionist view, personal identity is an all-or-nothing "further fact" that exists independently of the brain or body. In contrast, Parfit champions a **reductionist** approach, positing that persons are not separately existing entities over and above their interrelated mental and physical states. Drawing on science-fiction thought experiments, such as *teletransportation*, and empirical neuroscience regarding *split-brain cases*, Parfit argues there is no evidence for a Cartesian soul, concluding that in attempting to explain the unity of consciousness, "Egos are idle cogs". Instead, Parfit argues that personal identity is grounded in what he famously terms **"Relation R"**. Relation R is defined as "psychological connectedness and/or continuity with the right kind of cause". *Connectedness* refers to the holding of direct psychological links (such as remembering a past event or acting on a past intention), whereas *continuity* consists of "overlapping chains of strong connectedness". The most radical conclusion of Parfit’s philosophy is that strict identity is not "what matters in survival". Through "fission" thought experiments—where a brain is split and transplanted into two bodies—Parfit demonstrates that Relation R could conceivably branch into multiple future people. Because identity is strictly a one-to-one relation, identity is technically lost in a branching scenario, but everything that actually matters (psychological survival) remains intact. Ultimately, Parfit concludes that "the fact of personal identity just consists in the holding of relation R, when it takes a non-branching form".

• bartleby.com
• colorado.edu
• scribd.com
• philpeople.org
• academia.edu
• cmc.edu
• stanford.edu
• scirp.org

The role of the medial prefrontal cortex in maintaining the temporal continuity of the self

In contemporary neuroscience and consciousness studies, the temporal continuity of the self—the persistent feeling of being the same entity across the past, present, and future—is understood as an active neurocognitive construct rather than a philosophical given. The medial prefrontal cortex (mPFC), a core functional hub of the brain's Default Mode Network (DMN), plays an indispensable role in generating this unified subjective timeline. The discipline bridges neural architecture with subjective experience through the concept of "autonoetic consciousness." Originally pioneered by memory researcher Endel Tulving, this term describes the human capacity for mental time travel. It refers to the reflective ability to "mentally represent a continuing existence", allowing individuals to re-experience past events or project themselves into future scenarios from a persistent first-person perspective. Within this framework, the mPFC grounds time travel in self-relevance. As Gusnard and colleagues posited in their foundational fMRI research, "self-referential mental activity and emotional processing represent elements of the default state" mediated by the mPFC. Neuroimaging experiments have consistently mapped how the mPFC binds identity across time. D'Argembeau et al. demonstrated that mPFC activation modulates based on temporal perspective; it peaks when reflecting on the present self, leading to the hypothesis that the mPFC "might sustain the process of identifying oneself with current representations of the self" against temporally distant versions. Behavioral consequences arise when this projection fails: Jason Mitchell’s fMRI studies show that people who make shortsighted, impulsive decisions exhibit diminished ventromedial prefrontal (vMPFC) activity when anticipating the future. This points to a literal "failure to fully imagine the subjective experience of one's future self". To explain *how* this is achieved physically, researchers like Georg Northoff propose mechanisms of "temporal pooling" within the mPFC. Through the integration of slow, spontaneous neural frequencies, the brain weaves discrete moments together, such that "temporal continuity on the neuronal level of the brain's spontaneous activity mediates temporal integration and thus continuity on the psychological level of self". Ultimately, the mPFC is what synthesizes disparate memories and future simulations into a coherent, enduring "I."

• wikipedia.org
• nih.gov
• mdpi.com
• tandfonline.com
• nih.gov
• pnas.org
• nih.gov
• cambridge.org

Personal identity and the four-dimensionalism vs three-dimensionalism debate in a relativistic block universe

In modern physics, the debate between four-dimensionalism and three-dimensionalism regarding personal identity is heavily weighted toward four-dimensionalism, driven by the implications of Albert Einstein’s Special Theory of Relativity. Physics largely conceptualizes reality as a "block universe" (or Minkowski spacetime), an eternalist framework wherein all events—past, present, and future—coexist equally, and time does not objectively "flow". Within this relativistic paradigm, three-dimensionalism (or endurantism)—the view that individuals are 3D entities that exist wholly at a singular "present" moment—is fundamentally challenged. Because Special Relativity dictates the "relativity of simultaneity," observers moving at different speeds will disagree on which events occur at the same time, rendering a universal "now" physically untenable. Consequently, physics aligns much more naturally with four-dimensionalism, specifically a model known as "perdurantism". Under this distinctive terminology, persons are understood as four-dimensional "space-time worms" composed of successive "temporal parts". A person experiencing a single moment is merely a 3D temporal cross-section of a much larger 4D whole extending seamlessly from birth to death. Key figures cementing this tradition include C.W. Rietdijk (1966) and Hilary Putnam, whose seminal 1967 paper "Time and Physical Geometry" argued that relativity mathematically necessitates a tenseless existence. Using the relativity of simultaneity, Putnam deduced that "future things (or events) are already real". Contemporary physicists continue to defend this geometry robustly; for instance, physicist Vesselin Petkov argues that if the universe were merely three-dimensional, "the kinematic consequences of special relativity and more importantly the experiments confirming them would be impossible". In summary, modern physics views personal identity not as an enduring 3D object moving through a passing timeline, but as a static, four-dimensional whole permanently embedded in the spacetime geometry of the block universe.

• zygonjournal.org
• wikipedia.org
• substack.com
• joshetasrinivasan.com
• stanford.edu
• srce.hr
• 1000wordphilosophy.com
• quora.com
• informationphilosopher.com
• researchgate.net

Ibn Arabi doctrine of the renewal of accidents and the ontological status of the soul

In the Akbarian tradition of Islamic mysticism (Sufism), the doctrine of the "renewal of accidents" is transformed into the profound metaphysical principle of the perpetual "renewal of creation" (*tajaddud al-khalq* or *khalq jadīd*). Formulated by Muḥyī al-Dīn Ibn ʿArabī in his seminal text *Fuṣūṣ al-Ḥikam* (The Seals of Wisdom), this framework builds upon the Ash'arite theological concept of the "renewal of accidents" (*tajdīd al-aʿrāḍ*)—whereby temporary physical traits are constantly destroyed and replaced by God—and expands it into a universal theory of continuous divine self-disclosure (*tajallī*). According to Ibn ʿArabī, the cosmos is continually annihilated and recreated at every instant. This occurs through the inhalation and exhalation of the "Breath of the Compassionate" (*al-nafas al-raḥmānī*). Because the Divine Names are infinite, God never manifests in the exact same form twice; thus, the universe experiences a constant renewal of forms while absolute Being (*wujūd*) remains singular and unchanged. Within this paradigm, the ontological status of the human soul (*nafs*) is entirely contingent and dependent. The soul possesses no independent reality; its fundamental reality exists as an "immutable essence" (*ʿayn thābita*) within the Divine Knowledge. In the phenomenal world, the soul operates as an intermediate realm (*barzakh*) and a polished mirror designed to reflect the Divine Qualities. In the *Fuṣūṣ*, Ibn ʿArabī famously describes the ontological rank of the perfected human by stating: "He is in relation to Allah as the pupil... is to the eye... It is by him that Allah beholds His creatures". Consequently, the soul's existence is a state of perpetual becoming, entirely reliant on God's continuous manifestation. It is "nothing other than the result of the predisposition of that fashioned form to receive the overflowing perpetual *tajallī* which has never ceased". By recognizing that its existence is completely borrowed, the soul actualizes the truth of *Waḥdat al-Wujūd* (the Unity of Being). This mystical epistemology deeply influenced later Islamic philosophy, notably allowing figures like Mullā Ṣadrā to synthesize Ibn ʿArabī's insights on the soul's imagination and continuous renewal into the broader philosophical doctrine of the gradation and fundamentality of existence.

• uinsgd.ac.id
• sufi.ir
• sufipathoflove.com
• calarts.edu
• medium.com
• thesapience.in
• mohammedrustom.com

Functionalism and pattern identity theory regarding the survival of the self in substrate-independent minds

Within the frameworks of information theory and the simulation hypothesis, functionalism and pattern identity theory (often referred to as "patternism") argue that the "self" is not tethered to biological matter. Instead, these traditions posit that personal identity and consciousness survive as long as the mind's exact informational architecture and causal dynamics are preserved. The cornerstone of this paradigm is **substrate independence**, the philosophical premise that cognitive processes can emerge from any physical system—biological or artificial—provided it replicates the correct functional organization. Because functionalism treats the mind fundamentally as an information-processing system, transferring the self to non-biological mediums via **Whole Brain Emulation (WBE)** is considered theoretically viable. Proponents of the simulation hypothesis take this a step further: if our universe is already a computationally generated reality, human consciousness is inherently informational, which inherently validates substrate independence. Several key figures and theories anchor this discipline. Philosopher Nick Bostrom explicitly grounded his foundational 2003 *Simulation Argument* on the assumption of substrate independence, arguing that conscious minds can be generated by purely computational processes. Additionally, Giulio Tononi’s **Integrated Information Theory (IIT)** is frequently cited to explain how consciousness mathematically emerges from complex, recursive informational networks rather than specific physical substances. Technological advocates like Randal Koene have further championed WBE as a practical, evidence-based pathway to achieving substrate-independent minds. At its core, this discipline argues that matter is secondary to structural arrangement. Because "mental states supervene on patterns of information processing rather than specific material substrates", the transfer of human consciousness to digital formats is logically sound under this framework. Summarizing the pattern identity view on the survival of the self, advocates argue that "we are the pattern, not the particles," ultimately concluding that when it comes to consciousness, "the math doesn't care about the hardware".

• grokipedia.com
• medium.com
• unam.mx
• medium.com
• reddit.com
• scienceopen.com
• scribd.com