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Delta pattern: Binaural beats in the delta pattern operate at a frequency of 0.5–4 Hz with links to a dreamless sleep.  In the study, people who received a delta pattern frequency during sleep entered a deeper stage of sleep, according to electroencephalogram (EEG) brain scan results.  Theta pattern: Practitioners set binaural beats in the theta pattern to a frequency of 4–7 Hz.  Alpha pattern: Binaural beats in the alpha pattern are at a frequency of 7–13 Hz and may encourage relaxation.  The findings of a 2018 study suggest that listening to binaural beats for a recommended period can affect a person's subsequent behavior and sleep cycles.  Beta pattern: Binaural beats in the beta pattern are at a frequency of 13–30 Hz.  The binaural beat that a person perceives is the frequency difference between the waves entering the left and right ear.  According to a 2015 literature review, the tones should be at frequencies lower than 1,000 hertz (Hz) for the brain to detect the binaural beat.  Gamma pattern: This frequency pattern accounts for a range of 30–50 Hz.  For example, if the left ear registers a tone at 200 Hz and the right ear registers one at 210 Hz, the binaural beat is 10 Hz — the difference between the two frequencies.  Theta patterns contribute to improved meditation, creativity, and sleep in the rapid eye movement (REM) phase.  The study authors suggest that these frequencies promote maintenance of arousal while a person is awake.  This frequency range may help promote concentration and alertness.  However, it can also increase anxiety at the higher end of the range.