Abstract: A wearable signal acquisition and computerized display device including at least one first sensor configured to measure at least one of the following attributes from a subject wearing the device: attention, focus, concentration, alertness, and mood. The device has a heads-up display or goggles, glasses, or another head piece having lenses. The measurement is derived from the subject's brainwaves by use of one or more algorithms. The subject wearing the device receives neurofeedback data based on this measurement through the projected image to train them how to control attention, mood, etc. and improve understanding as to how various external stimuli in the real world or virtual world impact these attributes. In one variation the sensors measure brainwave signals at two positions of the subject and use the difference in these measurements to derive an attention indicator signal used to provide neurofeedback.