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When neurons (nerve cells) are ‘communicating’ or firing, they produce pulses of electricity known as ‘action potentials’ across the nervous system. This electrical activity creates ‘brain waves’ that can be measured in an EEG (electroencephalography) machine, typically found in hospitals and measured in Hertz (Hz).
Our mood, mental state, and feelings are strongly connected to different kinds of brain waves. For example, being asleep, on a rollercoaster, being intimate, and reading a book are associated with distinct brain wave patterns.
This pattern is observed in deep restorative sleep, even deeper than dream sleep, with the brain operating at a very low frequency of less than 4Hz.
Theta brainwaves are seen when someone’s eyes flicker during light Rapid Eye Movement (REM) sleep, occurring between 4Hz and 7Hz. However, Theta waves are also present in awake individuals during deep meditation, when completely absorbed in something calming and creative or practising formal relaxation – ‘in the zone’.
Alpha patterns emerge between 8Hz and 13Hz, typically when someone starts light meditation or focuses on a task. This state is calm and relaxed, yet alert.
Beta waves range between 14Hz and 30Hz and are common during the day. This state is characterized by high activity levels, such as rushing to complete tasks and ticking items off a to-do list. Concentration is high, and you’re alert and focused. However, being in Beta too much can lead to stress and anxiety.
The ‘limitless’ zone is a special type of crystal-clear focus marked by incredible productivity and extended periods of concentration. Significant ongoing research into Gamma waves is underway, especially noting that individuals practising Zen meditation often produce this pattern.
Use the list above to help you choose the right recording based on how you feel, and what you want to achieve.