This is what a one second sample of brainwaves looks like when graphed:
So based on these squiggly brainwaves, how do we calculate frequencies and amplitudes?
Luckily mathematicians have come up with a solution called “Spectrum Analysis using Fourier transform”. The basic idea is that every wave, no matter how complex and irregular, can be represented by combining a number of simple (sine and cosine) waves.
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