What is Consciousness: Spiritual & Scientific Perspectives

What Is Consciousness?

You are reading these words right now. There is something it is like to see the shapes on this page, to feel the temperature of the air, to hear any sound in the room. That basic fact, that experience has a felt quality, is what philosophers call consciousness.

Consciousness is not simply information processing. A thermostat processes information. A calculator computes. But neither has any inner life. Consciousness refers to that first-person dimension of existence: the redness of red, the pain of pain, the sense of being someone who is here, now, aware.

This seemingly simple observation turns out to be one of the most confounding puzzles in the history of human inquiry. Every civilization that has reflected seriously on existence has wrestled with it. What is mind? What is awareness? Does it arise from matter, or is matter itself somehow a product of it?

The 21st century has brought scientists, philosophers, and contemplatives into closer dialogue on these questions than at any previous point in history. The answers are not settled, but the conversation has never been richer or more urgent.

The Materialist View: Consciousness as Brain Product

The dominant framework in contemporary neuroscience and philosophy of mind is physicalism (sometimes called materialism): the view that consciousness is entirely produced by the physical brain. On this account, there is nothing more to mind than neurons, synapses, electrical signals, and neurochemicals.

Neural Correlates of Consciousness

Neuroscientists search for neural correlates of consciousness (NCCs), the minimal brain mechanisms sufficient for any specific conscious experience. fMRI studies, EEG recordings, and lesion analysis have revealed consistent patterns. The prefrontal cortex, thalamo-cortical loops, and the default mode network all appear involved in conscious processing.

Francis Crick and Christof Koch proposed in the 1990s that 40Hz gamma oscillations in the cerebral cortex might be the signature of conscious binding. Later work complicated this picture considerably, but the search for NCCs remains active and productive.

Eliminative Materialism

The most radical materialist position is eliminative materialism, associated with philosophers Patricia and Paul Churchland. They argue that folk psychological concepts like beliefs, desires, and qualia will eventually be replaced by a mature neuroscience. On their view, what we call consciousness is not a deep mystery but a confused concept that will dissolve under scientific scrutiny.

Most philosophers find this position difficult to sustain. Eliminating the concept of experience does not eliminate experience itself. The felt quality of pain cannot be made to disappear simply by redefining it as nociceptor activation.

Functionalism

Functionalism, associated with philosophers like Jerry Fodor and Hilary Putnam, holds that what matters for consciousness is not the specific physical substrate but the functional organization of a system. Mental states are defined by their causal roles. This opens the door to the possibility that silicon-based systems or other non-biological substrates could be conscious if organized appropriately.

Functionalism is widely influential in artificial intelligence research. It also underlies the intuition that consciousness is about information processing and integration rather than specific biological chemistry.

Alternative Scientific Theories

Dissatisfaction with simple versions of physicalism has driven researchers to develop more sophisticated theories. Three have generated the most serious scientific and philosophical interest.

Integrated Information Theory (IIT)

Neuroscientist Giulio Tononi at the University of Wisconsin developed Integrated Information Theory, which holds that consciousness corresponds to a system's capacity to generate information that cannot be reduced to the information generated by its parts. This capacity is measured by a quantity called phi (Φ).

A system with high phi has a rich inner life. A system with phi near zero is essentially a philosophical zombie, processing information but experiencing nothing. The brain's thalamo-cortical system scores extremely high on phi. Simple computers, despite their processing power, score very low.

IIT has a striking implication: consciousness is not exclusive to biology. Any physical system with sufficiently high phi is conscious to some degree. This aligns IIT unexpectedly with panpsychist intuitions. IIT also predicts that the cerebellum, despite its billions of neurons, contributes little to consciousness because its architecture produces low phi, a prediction supported by clinical cases where cerebellar damage causes surprisingly little change in conscious experience.

Global Workspace Theory (GWT)

Cognitive neuroscientist Bernard Baars and later Stanislas Dehaene developed Global Workspace Theory. Consciousness, on this account, arises when information is broadcast widely across the brain through a global workspace, making it available to multiple cognitive processes simultaneously.

Think of the brain as a large organization with many specialized departments. Most processing is local and unconscious. Consciousness occurs when information is placed in a central workspace and broadcast company-wide. This is why you become conscious of something when you attend to it: attention recruits the global broadcast mechanism.

GWT has strong experimental support and is the leading cognitive theory of consciousness. Its limitation is that it describes the access conditions for consciousness without fully addressing why global broadcast should feel like anything.

Quantum Mind and Orchestrated Objective Reduction (Orch-OR)

Physicist Roger Penrose and anaesthesiologist Stuart Hameroff proposed that consciousness involves quantum processes in microtubules, tiny protein structures inside neurons. Their Orchestrated Objective Reduction (Orch-OR) theory holds that quantum superpositions in microtubules collapse in an orchestrated way that generates moments of conscious experience.

Most neuroscientists are sceptical that the warm, wet environment of the brain is suitable for the delicate quantum coherence Orch-OR requires. However, quantum coherence has been demonstrated in biological systems including photosynthesis and bird navigation, making the proposal less implausible than it once seemed.

Penrose's deeper motivation was the observation that human mathematical insight seems to transcend what any computable algorithm could achieve, suggesting that consciousness requires non-computable processes. Whether this is correct remains deeply contested.

The Hard Problem of Consciousness

In 1995, philosopher David Chalmers published a paper that reframed the entire debate. He distinguished between what he called the easy problems and the hard problem of consciousness.

The easy problems (Chalmers acknowledges they are not actually easy) are questions about cognitive functions: how does the brain integrate information? How does it control attention? How does it report on its internal states? These are difficult scientific questions, but they are tractable. We know roughly what kind of explanation would count as a solution.

Why Qualia Are Philosophically Puzzling

The hard problem is fundamentally different. Even if we had a complete account of every neural mechanism underlying perception, we would still face the question: why is all this processing accompanied by experience? Why is there something it is like to be a brain doing these things?

Chalmers calls the felt qualities of experience qualia. The redness of red. The painfulness of pain. The specific taste of coffee. These are not measurable in third-person physical terms. They are the first-person character of experience. And no amount of third-person neuroscience seems to logically entail their existence.

This explanatory gap has resisted every attempt to close it. Some philosophers, like Daniel Dennett, argue the gap is illusory, a product of confused thinking. Most disagree. The felt quality of experience seems to be a genuine datum that any complete theory of nature must account for.

Chalmers' Naturalistic Dualism

Chalmers himself does not believe consciousness is supernatural. He proposes that information has two aspects: a physical aspect (causal role in a system) and a phenomenal aspect (felt quality). Consciousness would then be a natural feature of certain information-processing systems, irreducible to purely physical description but not outside nature. This position is sometimes called property dualism or naturalistic dualism.

It is a position that opens unexpected dialogue with spiritual traditions that treat consciousness as a basic feature of reality rather than a late product of biological evolution.

Panpsychism: Consciousness as Fundamental

Panpsychism is the view that consciousness or proto-conscious properties are fundamental and universal features of reality, present at the most basic level of nature rather than emerging only in complex biological systems.

This is not the claim that rocks have rich inner lives. It is the claim that even elementary particles have some minimal intrinsic nature that is the basic ingredient from which richer consciousness is built. Philosopher Philip Goff calls these minimal intrinsic properties proto-conscious, the raw material of experience that becomes rich consciousness when organized in certain ways.

Why Philosophers Are Taking It Seriously

Philosophers Galen Strawson, David Chalmers, and Philip Goff have all argued that panpsychism handles the hard problem more coherently than its rivals. Physicalism struggles to explain how objective brain processes produce subjective experience. Dualism struggles to explain how a non-physical mind interacts with a physical brain. Panpsychism sidesteps these problems by treating experience as a basic feature of nature from the start.

Strawson argues that emergence of consciousness from non-conscious matter would be miraculous in a way that no other scientific explanation requires. It would be the one place where nature produces something from nothing. Treating the intrinsic nature of physical properties as proto-conscious avoids this.

The Combination Problem

Panpsychism faces its own challenge: the combination problem. How do many micro-conscious entities combine to produce the unified, rich consciousness of a human being? If electrons have proto-conscious properties, why does a brain full of electrons experience unified awareness rather than a cacophony of disconnected micro-experiences?

Philosophers are actively working on this. Proposed solutions include cosmopsychism (consciousness is fundamentally one, not many), constitutive versus non-constitutive panpsychism, and approaches that draw on Integrated Information Theory's notion of integrated information.

Spiritual Traditions on Consciousness

Long before the modern scientific era, contemplative traditions across the world had developed sophisticated accounts of the nature of consciousness. These are not merely poetic metaphors. They represent thousands of years of first-person investigation into the nature of awareness.

Advaita Vedanta: Consciousness as the Only Reality

Advaita Vedanta, the non-dual school of Hindu philosophy codified by the 8th-century philosopher Adi Shankaracharya, holds that Brahman, pure unbounded Awareness, is the only ultimate reality. The apparent multiplicity of selves and objects is maya, a superimposition on the one undivided Awareness, somewhat as a snake is superimposed on a rope in dim light.

The individual self (Atman) is not a separate entity enclosed in a body. It is identical to Brahman. The sentence "Tat tvam asi" (That thou art) from the Chandogya Upanishad points directly to this identity. Ignorance of this identity is the root of suffering. Liberation (moksha) is not a future attainment but the immediate recognition of what has always already been the case.

This is a radically different framing from the scientific question of how the brain produces consciousness. For Advaita, asking how the brain produces consciousness is like asking how the movie screen produces the figures dancing on it. The screen was always there. The figures are appearances within it. Consciousness is the ground, not a product.

Yogacara Buddhism: Mind-Only

The Yogacara school of Mahayana Buddhism, associated with the 4th-century philosopher-monks Asanga and Vasubandhu, holds that all phenomena are representations arising within consciousness (vijnana). There is no independently existing external world separate from mind. This is sometimes called idealism, though Yogacara philosophy is more nuanced than Western idealism.

Yogacara posits eight types of consciousness, including a storehouse consciousness (alaya-vijnana) that carries karmic seeds across lifetimes. What we experience as an external world is the ripening of these stored impressions.

Tibetan Dzogchen, one of the most advanced teachings in Tibetan Buddhism, points directly to Rigpa, the natural luminous awareness that is the primordial ground of all experience. Rigpa is not a special state to be achieved but the already-present nature of mind, hidden only by conceptual overlay. Teachers like Longchenpa and Chokgyur Lingpa describe Rigpa as inseparable from the display of phenomena, a formulation strikingly parallel to Advaita's Brahman-maya relationship.

Western Mysticism

The Christian mystical tradition, represented by Meister Eckhart, Julian of Norwich, and John of the Cross, speaks of the ground of the soul (Seelengrund) as identical with the ground of God. Eckhart's claim that the eye through which I see God is the same eye through which God sees me anticipates the non-dual recognition of Advaita.

Neoplatonism, particularly Plotinus's concept of the One, treats consciousness as the emanative source from which all of reality flows. The One is not a thing among other things but the ground from which all things arise. Mystical return to the One is reunion with the source of consciousness itself.

Shamanic Perspectives

Shamanic traditions across cultures, from Siberian shamanism to Amazonian ayahuasca traditions, treat ordinary waking consciousness as one among many states of awareness. The shaman navigates between realms of consciousness, retrieving information and healing capacity from non-ordinary states.

Michael Harner's research on core shamanism identified consistent structures across apparently unrelated cultural traditions. The lower world, upper world, and middle world are not literal geography but maps of consciousness states accessible through specific techniques including drumming, plant medicines, and extended solitary practice.

These traditions share with Advaita and Dzogchen the conviction that ordinary waking consciousness is a narrow band of a much larger spectrum of awareness available to human beings.

Near-Death Experiences and Consciousness Research

One of the most significant empirical challenges to the brain-produces-consciousness model comes from near-death experience (NDE) research. NDEs are reported by people who have come close to death or been clinically dead and subsequently resuscitated.

Pim van Lommel's Landmark Study

In 2001, Dutch cardiologist Pim van Lommel and colleagues published a prospective study of 344 cardiac arrest patients in The Lancet, one of the world's most prestigious medical journals. The study was designed to address the standard objection that NDEs are simply hallucinations produced by a dying brain.

Van Lommel's team found that 18% of patients reported some degree of NDE, including out-of-body experiences, life review, a sense of overwhelming peace, encounters with deceased relatives, and in some cases, accurate perception of events in the operating room during cardiac arrest. Critically, some of these verified perceptions occurred during periods when the patients had flat EEG readings and no measurable brain activity.

Van Lommel concluded that current neuroscience cannot fully account for NDEs. He proposed that the brain may function as a receiver or interface for consciousness rather than its generator, analogous to how a television set receives a broadcast rather than creating it. His 2010 book Consciousness Beyond Life presents this case in detail.

Sam Parnia's AWARE Study

Cardiologist Sam Parnia at New York University conducted the AWARE (AWAreness during REsuscitation) study, placing visual targets on high shelves in cardiac arrest resuscitation rooms, visible only from above. Only a ceiling-mounted camera or an out-of-body observer would see them. While a small number of confirmed NDE cases emerged, only one patient could be cross-referenced with a specific verified perception during resuscitation.

Parnia views the results as preliminary and continues expanded research. The methodological challenges are considerable: NDEs are rare, and patients who have them are often too medically compromised to complete protocols.

Children's Past-Life Memories

A separate line of evidence comes from Ian Stevenson's decades of research at the University of Virginia, cataloguing cases of children who claimed detailed memories of past lives, often with verifiable details they had no normal means of knowing. Stevenson and his successor Jim Tucker have documented over 2,500 such cases. While critics propose normal explanations for many individual cases, the cumulative pattern resists easy dismissal and suggests at minimum that consciousness research should not be constrained by prior assumptions.

Institutions Investigating Consciousness

Several research institutions have made the investigation of consciousness, including its potential extension beyond the brain, a central focus.

Division of Perceptual Studies, University of Virginia

The Division of Perceptual Studies (DOPS), founded by psychiatrist Ian Stevenson at the University of Virginia, is one of the few university-based research units in the world that formally investigates phenomena suggesting consciousness may extend beyond the brain. Current research areas include children's claimed past-life memories, near-death experiences, deathbed visions, and apparitional experiences.

Current director Jim Tucker has published peer-reviewed studies and the book Return to Life, documenting American children who recalled verifiable past-life details. The division maintains rigorous methodology while remaining open to conclusions that standard materialism cannot accommodate.

Institute of Noetic Sciences (IONS)

The Institute of Noetic Sciences, founded by Apollo 14 astronaut Edgar Mitchell in 1973 after his own profound experience of unity consciousness during the return journey from the moon, conducts and funds research on the nature of consciousness and its relationship to physical reality.

IONS researchers including Dean Radin have published studies on anomalous cognition (distant mental influence, presentiment effects, and remote perception) in peer-reviewed journals. Radin's books Conscious Universe and Real Magic summarise this evidence base for general readers.

IONS also develops practical programmes for consciousness development, integrating mindfulness, body-based practices, and what Mitchell called noetic science, the systematic study of inner knowing.

Centre for Consciousness Studies, University of Arizona

The Centre for Consciousness Studies at the University of Arizona, co-founded by Stuart Hameroff (of Orch-OR), hosts the biennial Toward a Science of Consciousness conference, the largest interdisciplinary gathering focused on consciousness research. The conference brings together neuroscientists, philosophers, physicists, contemplatives, and clinicians in a format that explicitly values both first-person and third-person investigation methods.

Practices That Expand Consciousness

Across traditions and across modern research, certain practices reliably shift the quality and scope of conscious awareness. These are not merely relaxation techniques. They represent systematic methods for investigating the nature of mind from the inside.

Meditation: Stages and States

Contemplative traditions describe progression through recognisable stages of meditative development. Theravada Buddhism outlines the jhanas, successive stages of concentrated awareness characterised by increasing stillness, luminosity, and equanimity. Tibetan Buddhist stages of practice move from preliminary stabilisation through shamatha (calm abiding) to vipashyana (insight) to the direct recognition of Rigpa.

Neuroscientist Richard Davidson at the University of Wisconsin has studied expert meditators with decades of practice. Long-term meditators display sustained high-amplitude gamma wave activity (25-100Hz), associated with large-scale neural integration, even outside of formal meditation sessions. They also show measurably greater cortical thickness in attention-related areas and reduced amygdala reactivity to stressors.

A practitioner does not need decades of training to begin noticing the effects. Even eight weeks of mindfulness-based stress reduction (MBSR) produces measurable changes in grey matter density in the hippocampus and posterior cingulate cortex.

Breathwork

Pranayama (yogic breath control) and modern breathwork modalities including holotropic breathwork (developed by psychiatrist Stanislav Grof) and the Wim Hof method use controlled hyperventilation and breath retention to alter blood CO2 levels and shift states of consciousness significantly.

Grof documented thousands of non-ordinary states of consciousness induced through holotropic breathwork, reporting transpersonal experiences including a sense of unity with all existence, contact with archetypes, and apparent access to collective or historical memories. He concluded that the psyche is not confined to the individual brain but accesses a much larger field of information.

Breathwork is accessible and requires no substances. It can be practised safely with appropriate guidance. The shifts in awareness it produces give direct experiential evidence that consciousness is not a fixed point but a variable.

Plant Medicine in Ceremonial Context

Ayahuasca, psilocybin, and other psychedelic substances have been used in ceremonial contexts by indigenous cultures for centuries. The last two decades have seen a revival of academic research. Psilocybin studies at Johns Hopkins University and Imperial College London have produced striking results in treating depression, existential distress in terminal illness, and addiction.

The subjective reports of psychedelic experiences commonly include dissolution of the sense of separate self, unity with the environment, contact with what feel like non-personal or transpersonal dimensions of awareness, and a lasting shift in the sense of what is most real. These features are structurally identical to mystical experiences described in contemplative literature across cultures.

Robin Carhart-Harris and colleagues proposed the REBUS (Relaxed Beliefs Under Psychedelics) model, suggesting that psychedelics work by relaxing the brain's default hierarchical prediction framework, allowing suppressed information from lower brain regions to surface into awareness. This produces a temporarily more open, less constrained form of consciousness.

Ceremonial context matters. The set (mindset), setting, and integration process shape the character and lasting value of the experience. These are not recreational substances. Used carelessly they can destabilise rather than expand awareness.

Integrating Scientific and Spiritual Understanding

The relationship between scientific and spiritual accounts of consciousness is more complementary than it is adversarial, once we move past surface stereotypes on both sides.

Where the Traditions Converge

Integrated Information Theory, with its measurement of phi, implies that consciousness is a fundamental feature of nature present wherever information is sufficiently integrated. This is structurally close to the panpsychist and Vedantic claims that awareness is the basic fabric of reality. IIT does not invoke a soul or a God, but it arrives at a position that ancient contemplatives would recognise.

Van Lommel's NDE research, while not proving survival of consciousness, creates serious empirical pressure on the simple brain-equals-consciousness model. The researchers who take it seriously are not mystics but cardiologists publishing in The Lancet. The evidence is not conclusive. It is, however, sufficient to make dogmatic certainty about the brain-only model intellectually untenable.

The neuroscience of meditation demonstrates that regular first-person investigation of mind produces measurable changes in brain structure and function. This validates the contemplative claim that investigating consciousness from the inside is a legitimate form of inquiry with real consequences, not merely subjective fantasy.

Where Tensions Remain

Genuine tensions persist. Scientific method is third-person, public, and replicable. Contemplative investigation is first-person, private, and in some respects irreducible. The most sophisticated consciousness researchers are working to develop methodologies that honour both, treating first-person reports as data rather than noise.

Spiritual traditions often make metaphysical claims about the ultimate nature of reality (consciousness is the only reality, for example) that science, by its own methodology, cannot directly confirm or deny. This is not a defect of either approach but a recognition that they operate at different levels of inquiry.

The Most Open Frontier

Philosopher Thomas Nagel, in his 2012 book Mind and Cosmos, argued that the standard materialist account of nature is fundamentally incomplete because it cannot accommodate consciousness, cognition, or value without distortion. Nagel is an atheist and not a mystic. His critique comes from within analytic philosophy, and it shook the field.

The honest position at this frontier is that nobody fully understands consciousness. The brain science is impressive and productive. The philosophical analysis is sharper than it has ever been. The contemplative traditions have mapped inner space with extraordinary care over millennia. And still, as Chalmers noted, there is something left over, something that resists explanation in the usual terms.

That persistent remainder, the simple fact of experience itself, may be the most important clue about the ultimate nature of reality that we have. Whether it points toward a scientific theory not yet imagined, toward the identity of Atman and Brahman, or toward something no existing framework has yet articulated, it is worth following with rigour, openness, and genuine curiosity.