Abstract: A data acquisition unit for an EEG system includes pliant electrodes and/or a wireless transmitter that permit use of the EEG system without electrolyte gels or solutions and/or connecting wires. The electrodes can use a conductive fabric or a conductive rubber material that is dry or damp and mounted in a rigid structure that plugs into a socket on a headset. A feedback unit in the EEG system, which receives and processes the data from data acquisition unit, can be a high power, high performance processing system that implements complex feedback presentations and control functions based on analysis of the EEG data. In one embodiment, the feedback system controls a presentation player and adjusts a playback rate according to the sensed brain activity or synchrony between left and right brain activity. A PWM signal can control the time scale of the presentation.