Brain Signal Processing

I am currently researching on brain-computer interfaces where I recorded students brain signals and classified them into different levels of cognitive load.

In this study, I used Fourier transform (FFT) to convert the signals from time domain and frequency domain. Why is this important? You see, certain brain frequencies are correlated with activities. For example, alpha waves (8-13 Hz) are associated with alertness, while beta waves (14-30 Hz) are associated with high focus.

By using Fourier transform, we are able to access a different dimension of information that is more significant for our study.