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Binaural Beats - Article

Binaural Beats

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Binaural beat refer to the auditory responses related to the brain. binaural beat originate in the nucleus of each cerebral hemisphere. When two different auditory impulses of binaural beat, of two different frequencies interacts the binaural beat are produced. Theoretically binaural beat can be used to entrain specific neural rhythms and is possible to utilize it as a technique for consciousness management to entrain a specific cortical rhythm.

A German scientist, H. W. Dove, discovered binaural beat in 1839. The ability of a human being to hear binaural beat is a result of evolutionary adaptation. binaural beat are due to the brain structure of the human beings that they can detect binaural beat. The frequencies at which binaural beat can be detected depend upon the size of the species cranium. Human beings, detect binaural beat if the carrier waves are below 1000 Hz because at this frequency the wave length of the signal is longer than the diameter of the human skull.

Binaural beat signals having frequency below 1000 Hz curve around the skull by diffraction. The same effect can be observed with radio wave propagation. As frequencies below 1000 Hz curve around the skull, both ears hear incoming signals below 1000 Hz. But due to the distance between the two ears, the brain "hears" the inputs from the ears as out of phase with each other. As the sound wave passes around the skull, each ear gets a different portion of the wave. binaural beat are this waveform phase difference that allows for accurate location of sounds below 1000 Hz. Audio direction finding at higher frequencies is less accurate than it is for frequencies below 1000 Hz. At 8000 Hz the external ear becomes effective as an aid to localization.

Binaural beat works on the brain. When each ear hears two different frequency signals, the brain detects phase differences between these two signals. This detected phase difference would provide directional information under natural circumstances. When these phase differences are heard, the brain processes the irregular information differently and an integration of the two signals takes place, producing another beat frequency. The difference between the signals expands and collapses as the two different input frequencies and get interlaced to result constantly increasing and decreasing differences. This in turn give rise to an amplitude-modulated standing wave called the binaural beat. So the binaural beat are fluctuating rhythm of the difference between the two different frequency auditory inputs.

Binaural beat can be easily heard at low frequencies that are below 30 Hz. binaural beat facilitates the entrainment of brain waves and altered states of consciousness. The main effect of listening to binaural beat is relaxing and stimulating, depending on the frequency of the binaural-beat stimulation. Binaural beat in the range of 1 to 4 Hz and 4 to 8 Hz are associated with relaxed, meditative, and creative states and used as an aid to falling asleep. binaural beat in the range of 8 to 12 Hz have increased alpha brain waves and binaural beat in the range of 12 to 16 Hz are associated with reports of increased alertness and improved memory.

Hearing the binaural beat passively may not spontaneously propel human beings into an altered state of consciousness. binaural beat stimulation is influenced by a number of factors. For example, the willingness and ability of the listener to relax and focus contributes to binaural beat effectiveness in inducing state changes.

The binaural beat are related to an electro-encephalographic (EEG) frequency-following response in the brain. The EEG activity was termed as "frequency-following response" because its period corresponds to the fundamental frequency of the stimulus. binaural beat motivation appears to encourage access to distorted states of consciousness.
 
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