Brain, Consciousness, and the Soul: What Neuroscience Can and Cannot Explain

What does the text actually say?

The Quran says: “Allah brought you out of the wombs of your mothers knowing nothing, and gave you hearing and sight and hearts so perhaps you would be grateful” (16:78). The verse does not provide an anatomical map. It links the passage from not knowing to learning with the means of perception, and then directs knowledge toward gratitude.

In “Have they not travelled through the land so that they might have hearts with which to reason, or ears with which to hear?” (22:46), al-Tabari interpreted the context as reflection on the traces of those who rejected the message and grasping the argument, not as a lesson identifying the organ of thought. Al-Qurtubi recorded Arabic usage that attributes reason to the heart and discussed the question within the language and context of the verse. Turning it into a simplistic contest between heart and brain misses the point: it condemns failure to recognise meaning despite working eyes.

As for “They ask you about the spirit. Say: The spirit is of the command of my Lord, and you have been given only a little knowledge” (17:85), al-Tabari related the answer to the limits of human knowledge, while al-Qurtubi presented several interpretations of what “spirit” means. That plurality itself rules out claiming that the verse supplies one experimental definition of the spirit.

Consciousness is not a single thing

Distinguishing three levels helps resolve much confusion:

1. Wakefulness: the nervous system is in a state that permits responses.
2. Conscious content: what someone sees, hears or remembers at a given moment.
3. Self-awareness: attributing experience to oneself and being able to reflect on it.

A patient may open their eyes and show sleep–wake cycles without consistently purposeful behaviour. Another may be unable to move or speak while retaining some awareness. A single response or scan is therefore insufficient for diagnosis; clinicians use repeated behavioural assessments and sometimes EEG or imaging to look for covert responses.

Neuroscientific reviews show that brainstem systems and their connections with the thalamus and forebrain are necessary for the level of wakefulness, while conscious contents relate to distributed interactions in the cortex and its networks. There is no single “consciousness switch”: necessary functions are distributed, and causes differ across traumatic injury, oxygen deprivation, anaesthesia and degenerative disease.

What does anaesthesia establish?

Anaesthesia is not ordinary sleep. Different drugs act on different molecular and network targets, allowing researchers to trace a reversible transition between responsiveness and its loss. Reviews indicate that unresponsiveness often accompanies disrupted communication and integration across brain networks, but the mechanism is not identical for every drug or patient.

A methodological limit matters: immobility does not always prove the absence of all experience, and a later lack of memory does not necessarily mean there was no experience at the time. Research therefore separates consciousness, responsiveness, memory and attention. This protects patients from premature clinical conclusions and prevents a clinical sign from becoming a philosophical answer.

Four major theories, no final verdict

Several frameworks compete to explain consciousness. Global neuronal workspace theory proposes that content becomes conscious when broadcast widely and made available for report, memory and control. Integrated information theory focuses on intrinsic causal structure and integration that cannot be reduced to a sum of parts. Recurrent processing theories emphasise feedback within sensory systems, while higher-order theories connect consciousness with the brain’s representation of its own perceptual states.

A review in Nature Reviews Neuroscience described multiple families of theories with different predictions. In 2025, Nature published an adversarial collaboration testing predictions from global neuronal workspace and integrated information theories. Findings supported some predictions and challenged others on both sides; they did not crown a final theory. This is a strong scientific result because it makes disagreements testable, not evidence that “science knows nothing.”

Correlation, necessity and identity are different

If a change in colour experience accompanies activity in a region or network, that is a correlation. If repeatedly disrupting that network removes an ability, this provides stronger evidence of functional necessity. But moving from “this network is necessary for experience in a living person” to “experience is this network and nothing more” is a philosophical step requiring a further argument.

With caution, one might compare a damaged receiver that impairs reception without by itself settling the nature of the message. This analogy does not prove a separate spirit; it only illustrates that dependence alone does not logically establish identity. Conversely, the spirit must not be made a substitute explanation for every neural function we do not yet understand: such a “God of the gaps” retreats as knowledge grows.

Does the heart reason, or the brain?

The familiar question confuses language with measurement. In Arabic and the Quran, understanding, intention, hardness and tranquillity are attributed to the heart. This concerns a person’s inner orientation and moral direction; it does not assert that the heart muscle performs the computations of the frontal cortex. In medicine, information processing, language, memory and decision-making are related to neural functions that can be disrupted by particular injuries.

Respecting scripture requires no denial of neuroscience; neuroscience requires no redefinition of every Quranic word as an anatomical term. Each discourse should answer its own question: the text asks why a person fails to reflect and give thanks, while science investigates how systems of perception and decision work.

Can science disprove the spirit?

To test a claim, science needs an operational definition and repeatable observations or measurable effects. “Spirit” in Quranic discourse is not the name of a neurotransmitter or a physical field for which the verse provides an equation. No simple neuroscience experiment therefore verifies or refutes its existence.

This limit does not license attributing every unexplained phenomenon to the spirit or denying causes of illness. Epilepsy, psychosis and memory disorders require evidence-based assessment and treatment. Patients should not be morally stigmatised or denied medical care in the name of the unseen. Proper religious humility demands more rigorous care, not less.

A map of claims and evidence

What does the book add?

The strength of pages 116–123 of Qul Siru fi al-Ard is that they place the question of consciousness after the account of human formation: the mind appears neither as a machine detached from the body nor as matter without responsibility. This article adds three safeguards to the book: distinguishing the functions of consciousness from its nature, neural dependence from reductionism, and the limits of science from rejection of science.

Uncertainty thus becomes no ready-made proof of faith, and experimental success no ready-made proof of materialism. Exploring the human being becomes a double exercise: precision about what instruments measure and humility about what they cannot answer.

Final answer

What does neuroscience explain? Many conditions, networks and mechanisms enabling wakefulness, perception, memory and response. It can test rival predictions and improve diagnosis. What remains open? A comprehensive explanation of subjective experience, a verdict between theories, and the move from describing function to the nature of the human being and the spirit.

The verse does not fill a gap in the laboratory, and the laboratory does not erase the verse’s question. Between them stands a person responsible for hearing, sight and heart: to learn without claiming complete knowledge, and to protect the patient’s dignity as carefully as the accuracy of the evidence.

Frequently asked questions

Have scientists found where consciousness is located?

They have identified networks necessary for aspects of wakefulness and content, but no single agreed location contains all of consciousness.

Does anaesthesia turn the brain off completely?

No. Patterns of activity and communication change with the drug, dose and condition; the brain remains active in different ways.

Does the verse about the spirit forbid research?

No. It limits claims to comprehensive knowledge of the spirit’s nature, not the study of memory, perception, illness or treatment.

Does the heart think instead of the brain?

Measured cognitive functions depend on the brain. “Heart” in Quranic discourse concerns understanding, intention and moral orientation; it need not be treated as a competing anatomical claim.

Does the lack of a final answer about consciousness prove religion?

Not by itself. It marks a limit of current knowledge and prevents presenting either a materialist or spiritual philosophy as a completed laboratory result.

Sources

1. Al-Tabari, commentary on Quran 17:85, on the question of the spirit and the limits of knowledge.
2. Al-Qurtubi, commentary on Quran 17:85, on the different interpretations of “spirit.”
3. Al-Tabari, commentary on Quran 22:46, on travel, reflection and hearts that reason.
4. Al-Qurtubi, commentary on Quran 22:46, on the language of heart and reason and the verse’s context.
5. Anil K. Seth & Tim Bayne, Theories of consciousness, Nature Reviews Neuroscience, 2022.
6. Cogitate Consortium et al., Adversarial testing of global neuronal workspace and integrated information theories of consciousness, Nature, 2025.
7. Emery N. Brown, Ralph Lydic & Nicholas D. Schiff, General anesthesia, sleep, and coma, New England Journal of Medicine, 2010.
8. Nicholas D. Schiff, Recovery of consciousness after brain injury: a mesocircuit hypothesis, Trends in Neurosciences, 2010.
9. Lorina Naci, Leah Sinai & Adrian M. Owen, Detecting and interpreting conscious experiences in behaviorally non-responsive patients, NeuroImage, 2017.