Experiments in Sonification of EEG Signals

We wrote eegToTones.m in Matlab to convert EEG frequencies (in the range from 5 to 90 Hz) to audible frequencies to perform some biofeedback experiments. To test the code, we applied it to pre-recorded EEG signals recorded when subjects were performing various mental tasks.

Here are some examples of the results. Images are spectrograms, Fourier transforms of overlapping windows in time of the EEG signal. The span of time from left to right is 10 seconds.

Click on an image below to hear its sonification

EEG with 60 HZ Noise

Rotation Task, Channels O1 (left) and O2 (right)

Resting Task, Channel O1, Different Trial, with Eye blink

Counting Task, Channel O1