A neurofeedback technique uses color as its feedback cue. A preferred
embodiment of the invention includes an amplifier that receives EEG
signals from electrodes (e.g., adhesive electrodes, SQUID sensors, etc.)
on or adjacent the person's scalp, a low or band pass filter, a color
processor and a display. The color processor converts an aspect of one or
more channels of the person's EEG signal(s) to a color and shows that
color to the person on the display. The aspect of the EEG that is
converted to color can be the frequency or the amplitude of the person's
EEG signal(s). If EEG amplitude is used in the conversion process, the
instantaneous, average or peak amplitude can be used. This process is
dynamic, meaning that the system repeatedly converts the EEG signal to
color. Conventional adhesive electrodes or non-adhesive sensors can be
used to detect the person's brain activity.