The Placebo Effect vs. Measurable Results – What Clinical Studies Really Say

The Placebo Problem in Sound Medicine

The placebo effect is one of the strongest known effects in pain research and neurology – with effect sizes of up to d = 0.8 in certain contexts. Any serious evaluation of frequency therapy must account for this baseline. The question is not: "Does it help?" – but: "Does it help beyond the placebo effect?"

Objective Biomarkers: What Was Measured?

Well-designed studies use objective, non-self-reported endpoints:

EEG measurements: Direct measurement of brainwave activity – not influenced by expectations
Salivary cortisol: Objective stress marker (Yanagisawa et al., 2023)
Heart Rate Variability (HRV): Measurement of autonomic nervous system activity
Amyloid PET scans: In MIT GENUS research (animal studies)
Glutathione levels: Antioxidant measurement in cell cultures (Akimoto et al., 2018)

Double-Blind Studies: Possible with Sound?

True double-blinding is methodologically difficult in sound studies: participants notice whether they hear a tone. "Active sham" conditions (e.g., a different but similar tone as a control) are the methodological gold standard that only few studies consistently implement.

What Do Meta-Analyses Say?

The most solid meta-analysis of Binaural Beats to date (Garcia-Argibay et al., 2019, Psychological Research, 22 RCTs, n=1379) finds significant effects on anxiety, pain, and mood – with one caveat: Study quality is heterogeneous, and publication bias cannot be ruled out.

An Honest Conclusion

For some frequency applications (40 Hz, Binaural Beats in the Alpha/Theta range, ultrasound physiotherapy), there are indications of objectively measured effects beyond placebo. For other areas (Solfeggio frequencies as a wellness approach, Rife technology), the evidence base is too thin or qualitatively too weak for reliable conclusions.

Frequency Healings transparently marks this distinction with our evidence level system.