Hans Berger in 1929, psychiatrist, first observed brain waves over the the occipital cortex in his young son.
Found alpha waves b/w 8 and 12 Hz when his son closed his eyes.
When he opens eyes, alpha waves gone.
Gama rhythm, 30Hz or more, conscious visual perception and process of discovering a solution to a simple word problem.
Beta,14-40Hz,
Alpha rhythms, 8-12Hz,relaxation and many roles
Theta rhythm, 4-8hippocampal region and frontal cortex
Delta rhythm, 1-4sleep and memory,
Frequency Modulation(FM), silent less noise. Invented in 1933 by American engineer Edwin Armstrong. Wide-band FM is used worldwide to provide high-fidelity sound ober broad
Amplitude Modulation(AM), many noise.
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