Preferably, an embodiment of a sensor assembly includes at least a sensor probe providing a plurality of conductive spires, a compressible electrically conductive member in electrical communication with the sensor probe, a signal processing circuit in electrical communication with the compressible electrically conductive member, a housing confining the compressible electrically conductive member and sensor probe, a sensor probe support member supporting the sensor probe and cooperating with the housing to confine the compressible electrically conductive member, and a film of neurodiagnostic electrode paste applied to said spires, the film to the spires promotes improved conductivity of the subjects brain wave signals to a brainwave processing system. Continued use by the subject of the sensor assembly improves the conductivity of the subjects brain wave signals as the film coated spires adjust to the chemistry present on the subjects cranium.
