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Figure 17. If α and θ waves oscillate at their median frequencies (10 Hz and 5Hz, respectively), then every two α cycles, both will reach their oscillation peaks simultaneously (indicated by arrows). This will produce optimal binding energy between the α-created geon and the θ-γ modulated GR waves.

A geon is created by the global synchronization of alpha waves which oscillate at the frequency band 8-12 Hz. The theta wave is in the range 4-7 Hz. It is important to note that the median value (10 Hz) of the α band is about twice that (5 Hz) of the θ band. Such "doubling" structure may facilitate conscious perception. As explained in Chapter 13, constructive interference can increase the binding energy between GR waves. If the α frequency is twice the θ frequency, both will reach their oscillation peaks simultaneously for every two α cycles (Figure 17). This should facilitate the binding between the α-created geon and the θ-γ modulated GR waves.

The individual alpha peak frequency (iAPF) is defined as the maximal power value in the frequency spectrum between 8 and 12 Hz. It has been found that the attention-deficit/hyperactivity disorder (ADHD) is linked to lower iAPF. Furthermore, children with listening problems have frequency shifts in the theta and alpha bands. These findings are consistent with the notion that conscious perception of a sensory input originates from the binding between the α-created geon and the θ-γ modulated GR waves that encode the sensory signal.