Hush — Brain Cooler

the mechanism

Theta, rain and 6 hertz

Under your headphones, two things are happening. A soft ASMR layer, synthesized rain and slow droplets, triggers the gentle relaxation response measured in EEG studies: a 4-minute ASMR break during sustained attention reduced reaction times and prevented the fatigue-related build-up of frontal beta activity.¹

Underneath, quieter, a binaural beat: 200 Hz in one ear, 206 Hz in the other. Your brainstem reconstructs the 6 Hz difference, a theta-band rhythm associated with relaxation and early sleep states.² The ASMR layer stays louder than the binaural bed on purpose, roughly the ratio the research found optimal.

The rain you see is the rain you hear: every audible droplet lands on screen where it lands in your ears — left, right, center — and slowly wets the whole surface. Headphones matter: without them there is no binaural beat, just two tones.

Sun et al., Frontiers in Human Neuroscience, 2025. EEG analysis of ASMR fatigue recovery.
Garcia-Argibay, Santed & Reales, Efficacy of binaural auditory beats, Psychological Research, 2018. Meta-analysis.