Τι είναι η συνειδητότητα;

neural correlates of consciousness global workspace theory vs integrated information theory

In cognitive neuroscience, identifying the "neural correlates of consciousness" (NCC) is considered imperative for explaining how subjective experience emerges from biological brain activity. Two dominant, competing frameworks currently guide this search: Global Neuronal Workspace Theory (GNWT) and Integrated Information Theory (IIT). GNWT, developed by key figures like Bernard Baars and Stanislas Dehaene, approaches consciousness functionally. It likens the mind to a theater where information is selected and globally broadcast across a frontoparietal network. A distinctive hallmark of GNWT is the concept of "neural ignition"—a sudden, widespread burst of activity, heavily reliant on the prefrontal cortex, that makes information globally available to other cognitive systems. Conversely, IIT, championed by Giulio Tononi and Christof Koch, argues that consciousness is an intrinsic, structural property of certain causal systems. It measures consciousness via *Phi*, representing the degree of irreducible "integrated information". Unlike GNWT, IIT hypothesizes that the NCC relies primarily on "posterior cortical structures" (the back of the brain), predicting continuous, sustained neural synchronization as long as a conscious experience lasts. To empirically test these divergent claims, the discipline has increasingly embraced large-scale open science. Notably, the *Cogitate Consortium* conducted an ambitious "adversarial collaboration" pitting GNWT against IIT using fMRI, MEG, and intracranial EEG. The results, published in *Nature* in 2025, "were not decisive" and substantially challenged tenets of both models. IIT faced criticism due to a "lack of sustained synchronization within the posterior cortex," contradicting its core structural predictions. Meanwhile, GNWT was challenged by a failure to find generalized "neural ignition" at stimulus offset and a limited ability to decode conscious contents from the prefrontal cortex. Ultimately, while the field remains divided on whether consciousness is a functional broadcast or an integrated structure, researchers view these rigorous, theory-neutral adversarial tests as "an alternative approach to advance cognitive neuroscience through principled, theory-driven, collaborative research".

• plos.org
• singularityhub.com
• mit.edu
• medium.com
• preprints.org
• subconsciousmind.ai
• theintrinsicperspective.com
• nih.gov

Advaita Vedanta concept of Sakshi or witness consciousness and pure awareness

In Advaita Vedanta, **Sakshi** (Sanskrit: साक्षी), or witness consciousness, is defined as the pristine, unchanging pure awareness (*Atman*) that observes all physical and mental phenomena without being altered by them. Unlike the Western Cartesian tradition, which views consciousness as a property of the thinking subject ("I think, therefore I am"), Advaita asserts that pure awareness is primary and is the very nature of the Self. *Sakshi* is the silent observer of the mind's continuous fluctuations (*vrittis*) across the three states of human experience: waking (*jagrat*), dreaming (*swapna*), and deep sleep (*sushupti*). It corresponds to the transcendent "fourth" state (*Turiya*). Advaita teaches that everyday suffering arises when the individual ego (*jiva*) falsely identifies with its limiting adjuncts (*upadhis*)—the body, mind, and intellect. The witness, however, remains unconditioned. As summarized by modern commentators, "It does not suffer when the body suffers, though it is aware of that suffering". **Key Texts and Figures** The foundation for *Sakshi* is found throughout the Upanishads and the *Bhagavad Gita*. Chapter 13 of the Gita describes the *Kshetrajna* (the "knower of the field"), highlighting the ultimate neutrality of the witnessing consciousness. Later, the 14th-century philosopher Sri Vidyaranya articulated these nuances in texts like *Anubhutiprakasha*, distinguishing between the limited individual (*jiva*), the individual's witness (*jiva-sakshi*), and the supreme, unconditioned reality (*Brahman*). **Pedagogical Device vs. Absolute Reality** Ultimately, Advaita considers *Sakshi* an intermediate pedagogical concept. Twentieth-century sages like Ramana Maharshi emphasized that *sakshi* implies a subject-object duality (a witness and a thing witnessed). Sri Sadhu Om, a direct disciple of Ramana Maharshi, noted that because the absolute Self "exists as one without a second," describing it as a witness is "merely figurative" (an *upacara*). Once absolute non-duality is realized, the illusion of an external world vanishes, and the "witness" dissolves into pure, undifferentiated consciousness (*shudha-chaitanya*).

• innerspiritualawakening.com
• wikipedia.org
• youtube.com
• ozcrozz.com
• advaita.org.uk
• reddit.com
• tomdas.com

Orchestrated Objective Reduction Penrose Hameroff quantum consciousness theory

Within the intersection of modern physics and neuroscience, the Orchestrated Objective Reduction (Orch OR) theory posits that human consciousness is fundamentally a quantum-mechanical phenomenon rather than a byproduct of classical computational neural networks. Formulated in the 1990s by theoretical physicist Sir Roger Penrose and anesthesiologist Stuart Hameroff, Orch OR challenges the prevailing view that consciousness simply emerges from complex electrical interactions. Instead, the theory asserts that consciousness arises from "non-computable" quantum processing. A distinctive mechanism of this model is **objective reduction (OR)**—Penrose’s hypothesis that the collapse of a quantum wave function is not random or algorithmically determined, but rather governed by an objective threshold embedded in the fine-scale geometry of spacetime. This directly links quantum superposition to general relativity, utilizing the Diósi–Penrose model of gravity to explain why wave functions naturally collapse when a difference in spacetime curvature becomes unstable. Biologically, Hameroff and Penrose argue this process is "orchestrated" within **microtubules**—cylindrical structural proteins (polymers of tubulin) found inside neurons. The theory suggests that tubulin dimers act as qubits, sustaining quantum coherence long enough to reach the gravitational threshold for objective reduction. By embedding consciousness in physical laws, the theory proposes that "proto-conscious events are woven into the very fabric of physical reality," culminating in a moment of conscious experience whenever these coherent states undergo their gravity-induced collapse. Orch OR remains highly controversial. The primary "decoherence objection" argues that the brain's environment is far too warm and noisy to sustain quantum superpositions, suggesting microtubule states would decohere in femtoseconds. Furthermore, a 2022 underground experiment at the Gran Sasso laboratory in Italy tested the foundational Diósi–Penrose gravity-collapse mechanism, with physicists concluding that Orch OR is "highly implausible" under the simplest parameters of gravity-related wave function collapse. Despite this widespread skepticism, Orch OR remains the most prominent framework attempting to bridge quantum physics, relativity, and the hard problem of consciousness.

• wikipedia.org
• nih.gov
• acornabbey.com
• wm.edu
• physicsworld.com

Tibetan Buddhist teachings on the Eight Consciousnesses and the nature of the Alaya-vijnana

In Tibetan Buddhism, the framework of the Eight Consciousnesses (*aṣṭa vijñānakāyāḥ*) is foundational for understanding the mechanics of perception, ego-formation, and karma. Inherited primarily from the Mahayana Yogācāra tradition established by the seminal Indian scholar-monks Asaṅga and Vasubandhu, this model deconstructs the mind into distinct layers. Modern Tibetan masters, such as Chögyam Trungpa Rinpoche, emphasize that the point of meditation is to understand these eight consciousnesses because "together, they create our samsaric reality" while simultaneously serving as "the working basis of enlightenment". The first six consciousnesses consist of the five sensory consciousnesses (sight, hearing, smell, taste, and touch) and the sixth, the mental consciousness (*mano-vijñāna*), which assembles raw sensory input into coherent thoughts and images. The seventh is the defiled mental consciousness (*kliṣṭa-mano-vijñāna*), which obsessively reflects on the deeper stream of mind to construct a false, fixed sense of "self". Trungpa Rinpoche referred to this seventh layer as the "nuisance consciousness," noting it is the "home of our concepts, opinions, and inner discursiveness" and a primary source of suffering. At the very foundation lies the eighth consciousness: the *ālaya-vijñāna*. Translated as the "storehouse" or "base" consciousness, the *ālaya* operates continuously beneath standard conscious awareness. It acts as a vast repository for karmic imprints—known as "seeds" (*bīja*)—left behind by all past physical, verbal, and mental actions. When conditions are right, these seeds ripen to produce future experiences, ultimately dictating the cycle of rebirth. Crucially, Tibetan teachings clarify that the *ālaya-vijñāna* is not a permanent, eternal soul, but rather the unbroken "stream of consciousness called the life-process". While it is marked by "basic ignorance" and operates as "the ground of our experience of dualistic reality," rigorous Buddhist meditation aims to purify this storehouse. By dissipating the attachments and exhausting the karmic seeds stored within the *ālaya*, practitioners can collapse the illusion of dualism and transform their baseline consciousness into enlightened wisdom.

• wikipedia.org
• fabriziomusacchio.com
• lionsroar.com
• buddhism-dict.net
• wordpress.com

Kabbalistic levels of the soul Nefesh Ruach Neshama Chayah Yechidah and divine emanation

In Kabbalistic Judaism, the human soul is not a singular entity but a sophisticated composite of five distinct spiritual levels. This framework directly maps the soul's anatomy to the macrocosmic structure of divine emanation, specifically the *Sephirot* (divine attributes) and the descending spiritual Worlds. The five levels of the soul, in ascending order of spiritual refinement (often abbreviated as NRNCh"Y), are: * **Nefesh (Vitality/Life-force):** The lowest existential level, corresponding to the physical world of *Asiyah* (Action) and the sephirah of *Malkhut*. Hasidic tradition teaches that it resides in the blood. * **Ruach (Spirit):** The emotional center of the soul, corresponding to the world of *Yetzirah* (Formation) and the sephirah of *Tiferet*. It resides in the heart. * **Neshama (Breath/Intellect):** The cognitive or intellectual aspect, corresponding to the world of *Beriah* (Creation) and the sephirah of *Binah*. It is conceptually rooted in the brain. * **Chayah (Living Essence):** A transcendent, encompassing level reflecting the life-force of creation, corresponding to the world of *Atzilut* (Emanation) and *Chochmah*. * **Yechidah (Singular Oneness):** The absolute, unified essence of the soul. Rooted in the *Or Ein Sof* (Infinite Light) and corresponding to *Keter* (Crown) or *Adam Kadmon*, it remains in perpetual communion with God. This hierarchy was first outlined in early Midrashic sources but received its profound esoteric treatment in the *Zohar* (the foundational text of Jewish mysticism) and the 16th-century teachings of Rabbi Isaac Luria (the Ari). In Lurianic Kabbalah, the soul's development is deeply tied to *gilgul* (reincarnation) and *Tikkun* (spiritual rectification). A distinctive concept in this tradition is that a person does not automatically manifest all five levels. As Luria's *Gate of Reincarnations* explains, quoting the Zohar (94b): "When a person is born, he is given a Nefesh...". Through righteous deeds, fulfilling the commandments, and spiritual purification, an individual earns the higher vessels of *Ruach* and *Neshama*. Furthermore, while the first three levels are "internalized" within the body, *Chayah* and *Yechidah* act as transcendent, encompassing lights that remain strictly beyond physical containment.

• sefaria.org
• chabad.org
• abrahamicstudyhall.org
• sefaria.org
• chabad.org

David Chalmers hard problem of consciousness and arguments for panpsychism

Within analytic philosophy of mind, the historical dominance of reductive physicalism has faced a profound challenge over the last three decades. Recognizing that functional and structural scientific explanations struggle to account for subjective experience, analytic philosophers have overseen a rigorous revival of panpsychism—the view that mentality is a fundamental, ubiquitous feature of the physical world, offering an attractive middle path between materialism and mind-body dualism. The pivotal figure in this debate is David Chalmers, who catalyzed the movement with his 1995 presentations and his 1996 book, *The Conscious Mind*. Chalmers delineated the "easy problems" of consciousness (mechanistic explanations of cognitive functions, like learning or pain behavior) from the "hard problem". The hard problem is the formidable task of "explaining why any physical state is conscious rather than nonconscious," or why "there is 'something it is like' for a subject in conscious experience". Because one can logically conceive of philosophical "zombies"—hypothetical creatures physically and functionally identical to humans but completely devoid of inner phenomenal experience—Chalmers argues that traditional reductive physicalism is structurally insufficient. To solve this, contemporary philosophers like Chalmers, Philip Goff, and Galen Strawson have turned to panpsychist models. In his highly influential paper "Panpsychism and Panprotopsychism," Chalmers assesses the thesis that "some fundamental physical entities are conscious" (e.g., that it is like *something* to be a quark or photon). Alongside standard panpsychism, he also details *panprotopsychism*, the doctrine that basic physical entities are not fully minded themselves, but rather possess basic "protophenomenal properties" that give rise to conscious experience only when arranged into complex physical systems. The primary conceptual obstacle to both theories is the "combination problem" (historically rooted in the work of William James). This problem asks how discrete, fundamental micro-consciousnesses or proto-conscious properties can successfully combine to form the unified, subjective macro-consciousness of a human being. Despite this hurdle, analytic philosophy now treats panpsychism not as an absurdity, but as a mathematically and logically serious ontological candidate.

• stanford.edu
• besharamagazine.org
• utm.edu
• core.ac.uk
• wikipedia.org
• conscienceandconsciousness.com
• wordpress.com
• arxiv.org

Sufi psychology levels of the Nafs and the Heart as an organ of spiritual perception

Sufi psychology, deeply rooted in Quranic terminology, presents a transformative model of the human psyche centered on the dynamic interplay between the *Nafs* (lower ego), the *Ruh* (divine spirit), and the *Qalb* (spiritual heart). The ultimate goal of this discipline is *Tazkiya-I-Nafs* (purgation of the soul), moving the practitioner from ego-centeredness to divine submission. **The Heart (*Qalb*) as an Organ of Perception** In Sufism, the *Qalb* is not a physical organ but the locus of spiritual perception and decision-making. It is viewed metaphysically as the point of intersection between the pure, vertical ray of the *Ruh* and the horizontal, worldly plane of the *Nafs*. Sufi scholars often describe the heart as the "battleground of two warring armies: those of Nafs and Ruh". When the spirit is victorious, the heart is transmuted into an organ of divine perception, becoming the "tabernacle (mishkāt) of the Divine Mystery (sirr)". **Levels of the *Nafs*** The *Nafs* functions along a continuum of spiritual refinement. Sufi texts universally recognize three foundational Quranic stages of the soul's evolution: 1. **al-Nafs al-Ammarah** ("the soul which commands"): The lowest state, characterized by base, instinctual drives and egotistical passions. 2. **al-Nafs al-Lawwamah** ("the soul which blames"): The self-accusing consciousness that becomes aware of its own imperfections and struggles against sin. 3. **al-Nafs al-Mutma'innah** ("the soul at peace"): The serene soul that has achieved harmony, reintegrated into the Spirit, and rests in certainty. Many Sufi orders expand this framework into seven distinct stages (*maqams*), culminating in a perfectly purified soul (*Nafs al-Safiyya*). **Key Figures and Texts** This tripartite foundation of the psyche was first articulated systematically in early Quranic commentaries by figures such as Ja'far al-Sadiq. The discipline was subsequently expanded into a highly formalized psychological and spiritual framework by later luminaries like Bayezid Bistami, Hakīm at-Tirmidhī, Junayd, and Al-Ghazali, whose texts remain authoritative in understanding the cure of spiritual maladies.

• wikipedia.org
• onelittleangel.com
• reddit.com
• sunnirazvi.net
• purificationofthesoul.com