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What's a Brain Wave?

dag.stenberg at helsinki.nospam.fi dag.stenberg at helsinki.nospam.fi
Tue Apr 20 04:41:54 EST 1999

F. Frank LeFever <flefever at ix.netcom.com> wrote:
> I understand that something so simple as hyperventilation can increase
> theta, concurrently with diminished cognitive ability--but HOW?

During hyperventilation, CO2 is eliminated from the body, resulting in
vasoconstriction and redistribution of blood flow also in the brain (in
the periphery, one notices that hands and feet get cold and start to tingle).
The resulting hypoxia in brain tissue is accompanied by theta and even
delta waves in the EEG, especially noticeable in frontal areas.

Dag Stenberg
Dag Stenberg     MD PhD                    stenberg at cc.helsinki.fi
Institute of Biomedicine		   tel: (int.+)358-9-1918532
Department of Physiology                   fax: (int.+)358-9-1918681
P.O.Box 9        (Siltavuorenpenger 20 J)   
FIN-00014 University of Helsinki,Finland   

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