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Recently came across this on the net. Trusting that it is reliable

information thought it might be useful for us all.

Mark

1. Alpha rhythm in the two hemispheres is very similar in

frequency. A consistent difference of even 0.5 to 1.0 cps on the two

sides is significant; the side showing a slower frequency may have a

hemispheric dysfunction. Amplitude asymmetry is of relatively less

significance, unless the asymmetry is prominent. In general, the

alpha rhythm is higher in amplitude over the right hemisphere. If the

amplitude of the alpha rhythm on the right side is more than 1 1/2

times that on the left side, the asymmetry is usually regarded as

significant. When the alpha rhythm is over 25% higher in amplitude on

the left side than the right side, this constitutes a significant

asymmetry.[1]

Pearls, Perils, and Pitfalls In the Use of the Electroencephalogram

Omkar N. Markand, M.D., F.R.C.P.C.

Semin Neurol 23(1):7-46, 2003. © 2003 Thieme Medical Publishers

Posted 07/22/2003

1. Markand ON. Alpha rhythms. J Clin Neurophysiol 1990; 7:163-

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RE: Puzzler: Training Problem]

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