own work with the IBVA (E.E.G Interactive Brainwave Analyser) led to the development of a performance system that incorporated a Roland GR30 guitar synthesizer. Electrodes attached to the forehead provide a non localised measurement of cortical evoked potentials (neuron activity). Continuous monitoring of E.E.G produces can be broken down into analysis of signals within a particular frequency band (Beta, Alpha, Theta waves etc). The fluctuating amplitudes of these brainwave rhythms were mapped via Midi values controlling pan, modulation, timbre and additional effects for a guitar synth voice