2 Hz sits deep in the delta brainwave band — the dominant rhythm in infants up to one year of age, and the characteristic frequency of stages 3 and 4 of adult sleep. Delta waves at this frequency tend to be the highest in amplitude and the slowest in the brain's repertoire, reflecting a state of profound withdrawal from external stimulation.

We increase delta activity when the brain needs to decrease awareness of the physical world — during deep sleep, under general anaesthesia, and in certain meditative states achieved by experienced practitioners. The 2 Hz frequency is associated with the kind of complete rest that allows the nervous system to reset entirely.

Delivered here as a binaural beat with a 150 Hz carrier, the left ear receives 149 Hz and the right ear 151 Hz. The 2 Hz perceived difference creates a very slow, gentle pulsation designed to encourage your brain toward deep delta states. Best used with headphones in a dark, quiet environment.