Patent ID: 7738939

Claim:
A multielectrode for measuring a low amplitude bioelectrical signal at a detection site, the multielectrode comprising: a carrier including at least one active electrode surface and at least a first and a second reference electrode surface; and a processor in electrical communication with the carrier, the processor configured to: receive the low amplitude bioelectrical signal using the at least one active electrode surface and the at least first reference electrode surface, wherein the low amplitude bioelectrical signal is received in response to an applied bioelectrical stimulus signal; determine an evoked first bioelectrical potential difference a plurality of times, wherein the evoked first bioelectrical potential difference is based upon the low amplitude bioelectrical signal received using the at least one active electrode surface and the at least first reference electrode surface; receive the low amplitude bioelectrical signal using the at least one active electrode surface and the at least second reference electrode surface, wherein the low amplitude bioelectrical signal is received in response to the applied bioelectrical stimulus signal; determine an evoked second bioelectrical potential difference a plurality of times, wherein the evoked second bioelectrical potential difference is based upon the low amplitude bioelectrical signal received using the at least one active electrode surface and the at least second reference electrode surface; and sum the plurality of evoked first bioelectrical potential differences and the plurality of evoked second bioelectrical potential differences in order to increase the signal-to-noise ratio of the low amplitude bioelectrical signal.