He improved Berger's electroencephalograph and pioneered EEG topography. Biofeedback also can measure electrical brain activity through a test called the Electroencephalograph (EEG). EEG (electroencephalograph) and MEG (magnetoencephalography) have high temporal resolution, but a low spatial resolution. While studying with David Rosenboom Matthew developed a musical electroencephalograph biofeedback system. The electroencephalograph was primitive in the early 1930s, having only one channel.