A simple demonstration of how EEG is made up of simple Sine waves of different frequencies and amplitudes.

FFT Building Blocks

Adjust frequency and amplitude of each component. Top: 5 individual waves.
Middle: Their sum.
Bottom: Fake FFT power (amp²).

Power ≈ amplitude².
FFT panel shows these powers.

Wave 1

Wave 2

Wave 3

Wave 4

Wave 5

Sum of all waves (fake EEG)

"FFT" power for each component