February 03, 2009

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From Sound Location to iMusic: Binaural Beat Technology, a Premature Market ABSTRACT: Certain training devices and some sound effects can modify the global electrical activity of your brain. From epilepsy to some mood disorders targets for possible clinical uses keep growing. Though insufficiently studied an aggressively appealing new age industry is flooding the market with recordings that give promise of enhancing brain power; from meditation to memorizing, from relaxation to alert states of more efficient functioning. The confusing information around this not-so-new market and the Binaural Beats upon which it is construed have led this comprehensive review that explores the fundamentals of sound location, the Binaural Beat effect, brain waves and EEG biofeedback, in order to provide some basic information with which to confront the believe-it-or-not bet of new age "brain training". Introduction A Binaural Beat is a sound effect that creates a wave "inside the head" of the listener. As the frequency range of these waves is equivalent to that of electrical waves generated by brain activity binaural beats can be used to induce specific brain waves and thus, supposedly, to generate specific mental states. The whole matter is really that simple. The aim of this review is to discover how and to what extent all this is true and how and to what extent can the marketed promises of products such as Hemi-Sync or iMusic recordings be given any credit. The first part of this article is dedicated to sound location which will allow an understanding of what Binaural Beats are. Then some general ideas on the electrical activity of the brain and electroencephalographic (EEG) measures are purported to later discover how can those be modified, either with EEG biofeedback or Binaural Beat recordings, and its implications. Sound Location Under normal conditions any sound will stimulate both, left and right ears, independently. From...

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