Coombes described the process to CBC’s Calgary Eyeopener podcast. Her thoughts would be processed by headset via a computer, and then converted to voltages before being assigned to a parameter on the synth.

Thinking about images and questions that stimulated more brainwave activity yielded more dramatic results — even thinking about the word “why” had an effect on volume and pitch.

Her thoughts were processed and converted to voltages to control the synth made famous by Stevie Wonder.