A headset for detecting brain electrical activity is disclosed. The headset may have a flexible band having a first end and a second end. The flexible band may have at least one expansible region permitting a distance between the first end and the second end to selectably vary. The headset may also have flexible circuitry in the flexible band. The flexible circuitry may be operatively connected to at least one sensor configured to sense brain electrical activity. The headset may further have a stimulus emitter coupled to the flexible band.
