Mathematically Derived Frequency Correlates in Cerebral Function: Theoretical and Clinical Implications for Neurofeedback Training

Marvin W. Sams, Th.D., R. EEG T., QEEGT., L.Ac.
Technical Edito

Many cortical and subcortical areas of the brain have spontaneously occurring 3644 Hz (’40-Hz”) activity. Across the scalp, the EEG peak frequency of 40 Hz is z 39.5 Hz. A theory is proposed in which the brain has certain resident resonant frequencies that are subharmonics of 40-Hz activity. Some of these EEG frequencies are commonly trainedin  neurotherapy. Two examples are 12-15 Hz and 7-8 Hz activity, which are third and fifth subharmonics. Other frequencies with known cognitive and mental processing relation ships and mathematical associations to 40 Hz include ‘Frontal mid Theta” at 6.5 Hz (sixth subharmonic) and Theta at 4 Hz (tenth subharmonic). Exploring 40 Hz and its sub harmonics may provide further insight into the mechanics of the neurofeedback process and lead to more effective and efficient training. It is also anticipated that if the concept of 40-Hz subharmonics is explored, the mechanisms of cerebral function might be better understood.

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