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The Average Response Computer has proved a valuable tool for measuring statistics of neuroelectric activity, particularly of evoked responses. One of the most important aspects of the instrument is it ability to operate "on line," thus enabling the experimenter to observe and modify on the basis of the calculated results while the experiment is in progress. Although the ARC was designed to operate in fixed modes, it has demonstrated a gratifying flexibility in the face of new experimental requirements. With respect to future developments, we feel that greater speed of operation and extension to multiple channels would further extend the range of applications and increase the versatility of the device.