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<p></p><p style="text-align: center;"><br></p>The
first official classification of brainwave bandwidths was introduced by the International Federation of Societies for Electroencephalography and Clinical Neurophysiology in 1974. It is as follows: delta (0.5 – 4 Hz), theta (4-8 Hz), alpha (8-12 Hz), beta
(12-30 Hz), and gamma (&gt;30Hz). Hertz (Hz) is the measure of the speed of brainwaves, noting numerically the frequency in cycles per second. It has been hypothesized that the subconscious and sleep states (dominated by theta and delta) are linked to
the conscious states (13+ Hz) through the bridge of alpha brain waves (Wise, 2002, p. 53).
<br><br>Brainwaves are characterized by their speed (frequency), size (amplitude) and shape (morphology). More information can be inferred from their phase dynamics. Frequency is the power or speed of the electrical emissions, measured in hertz (Hz). Amplitude is the power of the electricity, measured in microvolts.
Pure microvolts is called magnitude and microvolts squared is called amplitude. Here are some other and important definitions. In EEG analysis and brain region analysis, it is helpful to think of the frequency as the adjective (i.e. theta = foggy, groggy,
fuzzy, trance-like, day-dreamy, “not all here,”) and the region that is affected as the noun.