#sound waves

[odinsblog]

NASA Data Sonification: Black Hole Remix

In this sonification of Perseus. the sound waves astronomers previously identified were extracted and made audible for the first time. The sound waves were extracted outward from the center. (source)

[reality-detective]

They put out fires using sound waves. 🤔

[fuckyeahfluiddynamics]

Making Sound Visible

Sound is not something we can typically see, though there are ways to visualize it, including cymatics and special acoustic cameras. This video pursues a different tactic: using schlieren photography and stroboscopic lighting to show how sound waves reflect and deflect. (Video and image credit: All Things Physics; submitted by David J.)

[mindblowingscience]

Sound waves create permanently water-repellent glass

Curtin University researchers have developed a new technique to make glass water-repellent, a feature that could improve safety in vehicles,

Curtin University researchers have developed a new technique to make glass water-repellent, a feature that could improve safety in vehicles, reduce cleaning costs for buildings and enhance filtration systems. The research, published in Advanced Functional Materials, shows how an innovative and non-toxic process using ultrasonic sound waves can alter the surface of glass, making it either hydrophobic (water resistant) or electrically charged.

Continue Reading.

[vintage-tigre]

[waterboy-zteam]

@batmanz

[theinterpretingbookworm]

a sonic dimension.

[shamandrummer]

How Does Shamanic Drumming Affect the Brain?

Shamanic drumming has been used by indigenous cultures for thousands of years as a tool for healing, altered states of consciousness, and spiritual exploration. At the heart of this ancient practice lies a rhythmic, repetitive beat--often played at around 4 to 7 beats per second--which has a profound impact not only on the emotional and spiritual body, but also on the brain itself. As modern neuroscience continues to evolve, we are beginning to understand more clearly how shamanic drumming influences brainwaves, consciousness, and psychological well-being.

The Science of Rhythm and the Brain

The brain is a rhythmic organ. It generates electrical impulses known as brainwaves, which are categorized based on their frequency: beta, alpha, theta, delta, and gamma. Each type corresponds to a different state of consciousness. For example:

Beta waves (13–30 Hz): active, alert, problem-solving state.

Alpha waves (8–13 Hz): relaxed, calm, meditative state.

Theta waves (4–8 Hz): deep meditation, creativity, dream-like states.

Delta waves (0.5–4 Hz): deep sleep, unconsciousness.

Shamanic drumming, especially when played at 4–7 beats per second, naturally encourages the brain to synchronize with the rhythm through a process called entrainment. Entrainment is the phenomenon by which biological systems align with an external rhythm. In this case, the external rhythm of the drumbeat nudges the brain into a theta state, which is associated with vivid imagery, intuition, and non-ordinary states of consciousness.

Entering the Shamanic State of Consciousness

In traditional shamanic practices, the drum acts as a bridge between the physical and spiritual worlds. When a shaman begins to drum at a steady tempo, it induces what many refer to as the "shamanic state of consciousness"--a deeply focused, trance-like state that allows for journeying, visioning, and spiritual healing.

This theta-dominant state is neurologically similar to what we experience during deep meditation, hypnosis, or REM sleep. It is a highly creative and receptive brain state in which the subconscious mind is more accessible. In this altered state, individuals often report:

Vivid visual imagery

A sense of timelessness

Heightened intuition

Connection to spirit guides or power animals

Emotional insights or healing experiences

The Drumbeat as Auditory Driving

The steady, monotonous rhythm of the shamanic drum is not designed for entertainment. Rather, it functions as a form of auditory driving, a technique that uses rhythmic sound to shift states of consciousness. Studies in psychoacoustics (the study of the perception of sound) have shown that continuous drumming can alter activity in various brain regions, including the thalamus and limbic system--areas associated with sensory processing and emotion.

Auditory driving through drumming can bypass the analytical, rational mind (associated with beta waves) and activate the intuitive, sensory parts of the brain. This is why people often feel as if they have entered a dream or vision-like state during a drumming session.

Neurological Benefits of Shamanic Drumming

In addition to altering consciousness, shamanic drumming has been shown to offer a range of psychological and neurological benefits:

Stress Reduction: Rhythmic drumming has been found to lower cortisol levels, the hormone associated with stress. A study published in The Journal of Alternative and Complementary Medicine found that group drumming sessions significantly reduced anxiety and improved mood among participants.

Emotional Regulation: Drumming stimulates the release of endorphins and endogenous opiates, which can help regulate mood and create a sense of well-being. The rhythmic pattern can also serve as an emotional anchor, helping individuals process and release trauma.

Enhanced Focus and Attention: Paradoxically, while shamanic drumming induces a trance-like state, it can also increase focus and attention. This is particularly true for people who struggle with overactive thoughts. The repetitive beat creates a focal point, helping quiet the mind and reduce internal chatter.

Neuroplasticity and Healing: Emerging research in neuroplasticity--the brain's ability to rewire itself--suggests that rhythmic activities like drumming can help re-pattern dysfunctional neural pathways. For trauma survivors, engaging in rhythmic drumming may offer a non-verbal pathway for healing that bypasses cognitive resistance.

Cross-Cultural Consistency

Interestingly, the use of repetitive rhythm to enter trance states is consistent across many indigenous cultures. From the frame drums of Siberian shamans to the ceremonial drums of Native American and African traditions, the power of rhythm transcends geography. The fact that such diverse cultures discovered similar methods independently points to a universal human capacity for rhythm-based transformation.

This cross-cultural consistency supports the idea that shamanic drumming taps into a fundamental neurological mechanism common to all humans. It is not tied to belief systems, rituals, or specific traditions alone--it works because of how our brains are wired.

The Drum as a Neurological Tool

While the spiritual significance of the drum should not be diminished, it is fascinating to consider the drum as a neurological tool. Modern practitioners often use recordings of shamanic drumming to facilitate meditative states, personal journeys, or even creative inspiration. Whether used in sacred ceremony or personal practice, the drumbeat becomes a functional mechanism for shifting consciousness and activating inner wisdom.

Integrating Science and Spirit

Science has only just begun to scratch the surface of what indigenous shamans have long known--that the drum is not merely a musical instrument but a tool for transformation. By understanding the brain-based mechanisms behind shamanic drumming, we gain new respect for ancient practices and how they align with modern therapeutic principles.

This fusion of ancient wisdom and neuroscience opens up exciting possibilities. Could shamanic drumming become part of trauma recovery protocols? Could it be used in therapeutic settings for mental health or addiction? As clinical research expands, the therapeutic and transformative potential of rhythm continues to be affirmed.

Final Thoughts

Shamanic drumming is far more than a rhythmic activity. It is a profound tool that interacts with our brain's natural rhythms to induce healing, insight, and altered states of awareness. Whether approached as a spiritual ritual or a neurological technique, its effects are undeniable. As we rediscover the science behind these ancient rhythms, we are reminded that the journey inward often begins with a simple, steady beat--a reminder that healing doesn't always require words, only rhythm, intention, and a willingness to listen.