View source for Slow alpha variant

* Two types of alpha variants
** '''Slow or sub-harmonic''' alpha rhythm
** '''Fast or harmonic''' alpha rhythm


* '''Slow alpha variant''' is usually half of the normal background rhythm
* Higher amplitude than the normal background rhythm
* Posterior dominant
* Suppressed with eyes open, mental stress or sleep, like the normal background rhythm (see [[Alpha rhythm]])
* Normal in healthy adults


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'''''Slow or subharmonic alpha variant in a 29 year old male(average).'''''
[[File:Slow_alpha_variant_in_a_29_year_old_man_(average).png|border|none|1200px|left]]


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