Mind Peak WaveRider Manual de instrucciones descargar pdf (Pagina 154)

WaveRider Operating Manual

154

BRAINWAVE GENERATION

Brainwaves typically range from 20-100 micro Volts and from 1-50 Hertz.

Alpha waves 8-12 Hertz are associated with a state of relaxed wakefulness. They are best

recorded over the occipital and parietal lobes. Quite often alpha waves can be generated by

simply closing the eyes.

Beta waves12-18 Hertz are normally seen over the frontal regions and over the other regions

during intense mental activity.

Theta waves 4-8 Hz normally appear first over the frontal regions of the brain. They are

usually seen when one is falling asleep.

Brainwaves are generated in the cortex by the flow of synaptic currents through the extra-

cellular space. Electrical activity of pyramidal cells is the principal source of brainwaves.

Pyramidal cells are so named because of the shape of the cell body. They often cross several

layers in the cortex and their dendrites are always oriented perpendicular to the surface of the

cortex.

Most potentials recorded from the scalp are the result of extra-cellular current flow associated

with the summated synaptic potentials in the activated pyramidal cells. Since pyramidal cells

are oriented parallel to one another and perpendicular to the surface of the cortex their

electrical sources and sinks do not cancel each other out and can be summed, thus creating a

measurable potential.

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Mind Peak WaveRider Manual de instrucciones Pagina 154