What does this video actually claim?
Liliya Akhmetzyanova claims natural sounds trigger measurable nervous system changes. She says flowing water, forest sounds, and birdsong activate the parasympathetic nervous system, reduce cortisol levels, and improve focus through rhythmic patterns.
Her post targets the biohacking crowd with promises of stress reduction and emotional balance. The claims sound scientific but need scrutiny.
Does the science back this up?
Natural soundscapes do affect the nervous system, but the evidence is mixed. A 2017 study by Gould van Praag et al. in Scientific Reports found that natural sounds increased parasympathetic activity compared to artificial noises. Heart rate variability improved when participants listened to water and bird sounds.
However, the cortisol story isn't clear-cut. A 2019 study by Franco et al. in International Journal of Environmental Research found forest bathing reduced salivary cortisol by 12.4% over 15 minutes. But this involved full forest immersion, not just audio.
The focus claims are weaker. While some studies show improved attention with nature sounds, the effects are often modest and temporary.
What did they get wrong?
Akhmetzyanova oversells the "measurable impact" without specifying what's actually measured. Most studies use subjective stress scales or short-term physiological markers, not long-term health outcomes.
She also ignores individual variation. The same 2017 study showed that people with anxiety disorders sometimes had opposite responses to nature sounds. What relaxes one person might agitate another.
The "familiar sounds signal safety" claim lacks citation. This sounds like evolutionary psychology speculation rather than tested science.
Should you trust sound therapy for stress?
Nature sounds won't hurt and might help some people relax. But don't expect miracle cures for chronic stress or anxiety disorders.
The research shows modest, temporary benefits. If you find ocean waves soothing, great. Just don't replace proven stress management techniques with a playlist.
Real stress reduction comes from sleep, exercise, social connection, and sometimes therapy or medication. Nature sounds can be a nice add-on, not a replacement.