The Science of Sound

How Sound Shapes the Nervous System, Consciousness, and Human Experience

By Brittany Danielle

Sound has been woven through my exploration of consciousness for a long time. I’ve experienced firsthand how music, rhythm, resonance, mantra, chanting, breath, and carefully designed audio can completely shift my internal state. I’ve used sound to regulate my nervous system, deepen meditation, and enter altered states of consciousness without the use of substances. Some of those states have also intersected with experiences in my life that I would describe as deeply spiritual or mystical.

Over time, that made me want to understand what was actually happening. Not just what I was experiencing, but what sound is physically doing to the body and brain, why humans have used it intentionally for so much of our history, and why it appears again and again in practices involving meditation, prayer, healing, trance, ritual, and mystical experience.

The deeper I’ve gone into it, the more fascinating it has become, because this is not remotely a modern discovery.

Human beings have been experimenting with sound for tens of thousands of years.

Before We Could Write About Consciousness, We Were Making Music

Some of the oldest securely identified musical instruments ever discovered are bone and ivory flutes found in caves in what is now southwestern Germany. They are more than 35,000 years old, with archaeological evidence suggesting sophisticated music-making was already present in Europe around 40,000 years ago.

That alone is remarkable to me.

This was before agriculture, cities, written language, modern medicine, neuroscience, or any scientific concept of acoustics. People were already intentionally creating organized sound.

And those are only the instruments that happened to survive.

Voices don’t fossilize. Neither do clapping hands, feet striking the earth, wooden drums, rattles made from organic material, or songs carried orally from one generation to another. So whatever archaeology is able to show us is probably only a tiny piece of humanity’s actual relationship with sound.

Hohle Fels vulture-bone flute, approximately 35,000–40,000 years old and considered one of the oldest surviving musical instruments known to humanity. Photo by Magalex via Wikimedia Commons, licensed under CC BY-SA 4.0. No changes made.

There is also fascinating research into the acoustics of prehistoric caves. Some researchers have found relationships between areas of Paleolithic caves containing artwork or markings and places with interesting resonance or reverberation.

We have to be careful here. Archaeology cannot tell us exactly what prehistoric people believed those sounds meant, and I don’t think we need to invent an ancient spiritual explanation where we don’t have one.

But I can’t help thinking about the experience itself.

Imagine walking deep into a cave by firelight thousands of years ago and hearing your voice leave your body, expand into the darkness, and come back to you from the stone.

They didn’t need to understand frequency or reverberation to know that it felt different.

That may be one of the most important threads running through this entire story. Humans were able to discover what changed their state long before they understood the mechanisms behind it.

Sacred Sound Becomes a Practice

Once we reach cultures that left written records, the relationship between sound and consciousness becomes much easier to follow.

Ancient India preserved one of the most extraordinary traditions of sacred vocal sound in human history. The Vedas were transmitted orally for generations using highly disciplined methods of recitation in which pronunciation, pitch, rhythm, and vocal form mattered enormously. The Samaveda in particular was created for melodic chanting in ritual.

The sound was not simply packaging for the words. The way the words were sounded mattered too.

From the enormous spiritual landscape of India developed many traditions of mantra, involving sacred syllables, words, phrases, or formulas repeated either aloud or internally. Mantra eventually became deeply embedded in Hindu, Buddhist, Jain, tantric, and other contemplative traditions.

Buddhism itself began in India and spread across Asia over centuries, carrying chanting, recitation, prayer, ritual music, and mantra into very different cultures.

When Buddhist traditions reached Tibet, they encountered an already existing religious landscape that became intertwined over time with the tradition now known as Bön. The history of Bön is complex, so I don’t think it is accurate to simply describe it as one unchanged “pre-Buddhist Tibetan religion.” The living Bön tradition developed alongside Tibetan Buddhism over many centuries.

But sound is deeply woven into Bön practice as well. Mantra, sacred syllables, breath, visualization, attention, and intention may all become part of the same practice.

From within those traditions, sound has spiritual meanings that extend far beyond what modern neuroscience can claim to verify. I think it is important to respect that distinction instead of forcing science and spirituality into pretending they are saying exactly the same thing.

What science can ask is: what happens inside the human being while they are doing this?

What happens to breathing, attention, emotion, neural activity, body awareness, arousal, and sense of self?

That is where the bridge gets really interesting.

Tibetan Buddhist monk chanting and playing a drum during meditation in Ghami, Upper Mustang, Nepal. Photo by RiverMountainPhoto via Wikimedia Commons, licensed under CC BY-SA 4.0. No changes made.

Humans Kept Discovering Sound in Different Ways

India and Tibet are only pieces of the story.

Across cultures, human beings developed chanting, drumming, bells, gongs, rattles, ceremonial songs, repetitive prayer, devotional singing, call-and-response, and collective rhythm.

Christian traditions developed forms of chant that turned prayer into extended melodic sound. Sufi traditions developed practices of dhikr, or remembrance of God, which can involve repeated names or phrases, rhythmic breathing, movement, and communal vocalization. Numerous Indigenous and shamanic traditions around the world have used drumming and ceremonial song within practices involving healing, trance, spiritual communication, or other altered states.

These traditions are not interchangeable, and I think we lose something important when we flatten them into one universal belief system.

But there is still a pattern here that is difficult to miss.

Again and again, human beings discovered that structured sound could change the way they felt, perceived, focused, prayed, connected, and experienced consciousness.

They did not have EEG machines or brain scanners. They had experience.

Now we have both.

So What Is Sound Actually Doing to Us?

At its most basic level, sound begins as vibration. Something moves, pressure waves travel through a medium, those waves reach the ear, and the auditory system transforms them into neural signals.

But hearing is not passive.

Sound interacts with systems involved in attention, emotion, memory, movement, prediction, and arousal. That is part of why a sudden noise can make your body react before you have consciously figured out what made it. A song can pull a memory into awareness almost instantly. Rhythm can make the body want to move. A familiar voice can create a completely different response than an unfamiliar one.

Our brains are constantly interpreting sound in context. Is this familiar? Is it threatening? Is it predictable? Is it beautiful? Is something approaching me? Is someone speaking to me? Have I heard this before?

This is also why there cannot be one universal formula where a particular sound automatically does the same thing to every nervous system. Personal history matters. Preference matters. Volume matters. Expectation matters. Context matters.

The same music that feels deeply calming to one person could be irritating to someone else.

Sound affects us, but we are not passive machines with identical settings.

When We Make the Sound Ourselves

This is one of the parts I find most fascinating.

Listening to sound from outside the body is one thing. Creating sound ourselves is something else entirely.

When we hum, sing, chant, pray, tone, or repeat a mantra aloud, we are coordinating several things at once. We are controlling breath, creating vibration through the vocal system, listening to the sound we are producing, feeling some of that vibration physically, and often repeatedly returning our attention to the same sound.

We also hear our own voice differently than we hear someone else’s because we receive it through both air conduction and bone conduction.

In other words, when we vocalize, the body becomes both the source of the sound and the body receiving it.

There is also a breathing component that I think sometimes gets overlooked. You cannot hold a long hum or chant without changing the way you breathe. Sustained vocalization naturally changes the length and control of the exhale. Many chanting and mantra practices combine that altered breathing pattern with repetition, focused attention, rhythm, meaning, expectation, and sometimes movement or visualization.

So when someone says chanting changes their state, the mechanism may not be one mysterious frequency doing something magical to the body.

It may be the entire experience working together.

Breath, sound, vibration, repetition, attention, rhythm, emotion, memory, meaning, and the physical act of vocalizing are all arriving at the nervous system at once.

This is why I think of many ancient sound practices as a kind of technology. Not technology in the sense of electronics, but technology in the older and broader sense of applying knowledge toward a purpose.

A mantra can be a repeatable method. A drum can be a tool for creating rhythm. A ritual can organize breath, attention, movement, emotion, and sound into one experience.

What Modern Science Is Beginning to Find

Scientists are now able to study some of these practices while they are happening.

A 2025 systematic review examining 24 neuroimaging studies of chanting, mantra, and repetitive prayer found recurring changes in brain regions associated with attention and emotional regulation. Some studies also found changes involving the default mode network, which is involved in self-referential thought, while EEG research frequently reported differences in theta activity.

That does not mean scientists have discovered one universal “chanting state.” The studies varied quite a bit in their methods, participants, and traditions.

But it does tell us that these practices are producing measurable changes worthy of serious study.

There is also research into mantra meditation and mental health. A 2022 systematic review and meta-analysis found small-to-moderate improvements in things like anxiety, stress, and depression compared with control groups. The researchers also pointed out limitations in the evidence, including study quality and the need for better long-term research.

I actually appreciate that kind of uncertainty.

I don’t think we need to claim that science has proven every ancient teaching about mantra in order for the research to be interesting. It hasn’t. What it is showing us is that practices human beings have used for centuries or millennia can produce measurable psychological and neurological effects.

That alone is worth understanding.

Rhythm, Entrainment, and Altered States

Rhythm adds another layer.

Our bodies are already rhythmic systems. The heart beats. Breathing cycles. Sleep follows rhythms. Movement has timing. Neural populations also produce rhythmic electrical activity.

External rhythm gives this biological system another pattern to interact with.

This is where the concept of entrainment comes in, although I think that word has been stretched almost beyond recognition in some corners of the internet.

Neural activity can synchronize or track aspects of rhythmic sensory stimulation under certain conditions. That is real.

What is not established is the idea that playing any arbitrary “healing frequency” automatically forces the entire brain into one predetermined state. The actual biology is more complicated, which I personally think makes it more interesting.

Researchers have studied experienced shamanic practitioners during rhythmic drumming and found measurable changes in brain activity associated with the altered states those practitioners reported. More recent studies have also found relationships between how strongly the brain tracks particular drumming rhythms and the intensity of altered experiences such as unity, disembodiment, or changes in self-perception.

Again, we don’t have every answer.

But rhythmic sound and altered consciousness are no longer topics science has to dismiss because they sound too strange to investigate. They can be studied.

From Drums and Mantra to Engineered Audio

Eventually humans learned how to create sound electronically and manipulate it in ways that traditional instruments could not.

One example is binaural beats. When slightly different tones are played separately into each ear through headphones, the listener may perceive a rhythmic beating corresponding to the difference between the two tones.

Scientists have investigated binaural beats for possible effects involving anxiety, attention, memory, pain, and other areas. Some studies and meta-analyses have found measurable effects, while others have produced inconsistent results.

So I would not describe binaural beats as magical frequencies that can reliably program the brain. But they are a real auditory phenomenon, and they represent a fascinating modern continuation of an ancient question:

What happens when we deliberately use sound to change our experience?

That question leads naturally into something that has become very meaningful in my own exploration of consciousness: The Gateway Experience.

My Experience With Gateway

The Gateway Experience grew from the work of Robert Monroe and the Monroe Institute. Instead of mantra or drumming, Gateway uses carefully engineered audio alongside guided mental practices intended to help the listener enter different subjective states of awareness.

The Monroe system calls these states Focus Levels. The descriptions of those Focus Levels belong to Monroe’s framework and should not be confused with established neurological categories, but the underlying idea still fascinates me.

I have spent a considerable amount of time working with Gateway, and I have experienced very deep altered states through it.

Some have been incredibly peaceful. Others have felt expansive or difficult to translate back into ordinary language afterward.

It is one thing to read academically that sound may influence consciousness. It is another thing entirely to put headphones on, lie still, listen, and feel the state from which you are experiencing reality change. For me, that deserves curiosity.

It doesn’t require me to decide in advance exactly what every experience means.

I can ask what happened to my attention, breathing, body awareness, perception, and nervous system while also asking a completely different question about the meaning of the experience.

Those questions can coexist.

Where Science Reaches the Edge

This is also where the subject becomes personally important to me, because sound has sometimes brought me into states of profound calm, connection, and expanded awareness that have intersected with experiences in my life that I would describe as mystical.

That includes some of my experiences surrounding the orb phenomenon.

I cannot honestly say that neuroscience explains those experiences. It doesn’t.

I also cannot scientifically claim that sound connected me to a universal field of consciousness or caused another intelligence to interact with me. Those are much larger questions than the science currently allows us to answer.

But I can study the state I was in. I can study what sound was doing to my nervous system. I can compare my experience with practices humans have used for thousands of years.

Understanding part of the mechanism does not automatically explain the meaning of an experience. Sometimes understanding the mechanism actually makes the mystery more interesting.

I don’t think science and spirituality need to be enemies here. Science can help us investigate what happens. Spirituality and philosophy can ask different questions about what an experience means.

Consciousness itself is still one of the biggest unresolved questions sitting between them.

Sound From Outside, Sound From Inside, and Sound Between Us

One useful way I’ve started thinking about all of this is in three categories.

There is sound coming from outside us: music, voices, drums, bells, nature, environmental noise, binaural audio, traffic, machines, and everything else entering through the auditory system.

Then there is sound created from inside us: humming, chanting, singing, prayer, mantra, toning, and our own voice. In those moments, we are actively creating part of the sensory environment influencing our own body.

Then there is sound between us: group chanting, choirs, congregational singing, drumming circles, ceremonial song, call-and-response, and people breathing, moving, listening, and vocalizing together.

Now sound becomes social.

Multiple nervous systems are participating in the same rhythmic environment.

Humans have been gathering around music and rhythm since before recorded history, and I don’t think that is a trivial detail about us.

Then We Arrive in the Modern World

After tens of thousands of years of humans intentionally creating sound, we now live inside an acoustic environment our ancestors could not have imagined.

Notifications, traffic, television, engines, HVAC systems, headphones, advertisements, machinery, podcasts, music, sirens, alarms, videos, and conversations surround us constantly.

Some of those sounds we choose. A lot of them we don’t.

We talk frequently about what we eat, what we watch, how much screen time we get, and how our environments affect our sleep.

But sound is also sensory input, and our nervous systems are receiving it whether we consciously pay attention or not.

That has started to make me think differently about my own sound environment.

What do I choose to surround myself with?

What happens to me after an hour of chaotic noise compared with an hour of music that I find regulating?

What happens when I chant? What happens when I hum?

What happens when I deliberately sit in silence?

And how often am I letting an algorithm decide what enters my ears without even thinking about it?

If sound can influence attention, emotion, arousal, breathing, and conscious experience, then becoming intentional about our relationship with sound may be much more important than we realize.

You Can Experiment With This Yourself

One of my favorite things about sound is how accessible it is.

You don’t necessarily need expensive equipment, singing bowls, special headphones, or even musical ability.

You already carry an instrument around with you. Your own voice.

If you want to experience this rather than only read about it, try something incredibly simple. Sit somewhere comfortable and notice how your body feels. Take an easy breath in, and then hum gently during the exhale. Don’t force it or try to produce any particular frequency. Just let the sound continue for however long feels natural.

Do that a few times, then stop and sit quietly for thirty seconds.

Notice what changed, if anything.

Maybe your breathing feels different. Maybe your chest or face feels different.

Maybe your thoughts seem quieter. Maybe you notice very little at all.

There is no correct mystical experience you are supposed to manufacture.

The interesting part is simply beginning to observe the relationship between sound and your own state.

An Ancient Technology We Never Lost

The more I learn about this, the more I think sound may be one of humanity’s oldest technologies for influencing our own experience.

A flute is technology. A drum is technology. A mantra can be a repeatable practice. A ritual can organize sound, breathing, movement, attention, and meaning. A cave, temple, or cathedral can create an acoustic environment that changes how sound is perceived.

Today, headphones can deliver precisely engineered audio separately into each ear.

The tools have changed enormously.

The human organism receiving the sound is still human.

We still soothe babies with our voices. We use music at weddings and funerals, in spiritual ceremonies, meditation, exercise, celebration, protest, grief, and love. We instinctively reach for different sounds when we want to feel different things.

Somewhere along the way, humans learned something very basic about ourselves:

Sound changes us.

Modern science is finally giving us increasingly sophisticated ways to investigate how, and I think we are still only beginning to understand what that means.

For me, that is what makes the science of sound so compelling. It sits at this beautiful intersection of archaeology, history, religion, neuroscience, psychology, nervous-system regulation, meditation, altered states, and the larger mystery of consciousness itself.

Some parts of this story are backed by strong scientific evidence. Some are still emerging. Some belong to ancient spiritual traditions. Some come from personal experience. And some remain unanswered.

I don’t think we need to blur those categories together.

But I do think they can sit beside one another.

We don’t have to exaggerate science to preserve wonder, and we don’t have to abandon wonder in order to take science seriously.

Humans have been exploring sound for tens of thousands of years, and we are still exploring it now.

The question I keep coming back to is what happens when we stop treating sound as something happening in the background of our lives and start becoming more intentional about our relationship with it.

Because we cannot control everything happening around us.

But we may have more ways of participating in our own internal state than we realize.

And sometimes one of the simplest places to begin is with something that has been available to us all along.

Sound.

Sources & Further Reading

Conard, N. J., Malina, M., & Münzel, S. C. (2009). New flutes document the earliest musical tradition in southwestern Germany 

Perry, G., Wolff, L., Powers, N., Thompson, W. F., & Baumann, O. (2025). Neural Correlates of Chanting: A Systematic Review 

Álvarez-Pérez, Y., et al. (2022).  Effectiveness of Mantra-Based Meditation on Mental Health 

Huels, E. R., et al. (2021).  Neural Correlates of the Shamanic State of Consciousness 

Gordon, Y., Karvat, G., Dagan, N., & Landau, A. N. (2026).  Neural tracking at theta predicts drumming-induced altered states of consciousness 

Aparicio-Terrés, R., et al. (2026).  Rhythmicity and Trait Absorption Are Linked to Nonordinary States of Consciousness 

Garcia-Argibay, M., Santed, M. A., & Reales, J. M. (2019).  Efficacy of binaural auditory beats in cognition, anxiety, and pain perception 

The Monroe Institute.  The History of Sound at the Monroe Institute 

The Monroe Institute. Gateway Voyage Online 

Image Credits

Hohle Fels vulture-bone flute. Photograph by Magalex, Wikimedia Commons. Creative Commons Attribution-ShareAlike 4.0 International.

Tibetan Buddhist monk in Ghami, Upper Mustang, Nepal. Photograph by RiverMountainPhoto, Wikimedia Commons. Creative Commons Attribution-ShareAlike 4.0 International.