Sokolov’s prediction of enhanced orienting response (OR) magnitude produced by stimulus intensities below about 50 dB was tested by essentially replicating his within-subjects paradigm with the GSR. Twenty-four subjects were tested with 20, 30, 40, and 50 dB SPL 1,000-Hz 2-sec tones of minimal significance with a unique order of tone presentation for each subject. A linear relation between GSR magnitude and stimulus intensity was obtained, contrary to Sokolov’s prediction. Habituation over eight stimulus cycles was obtained, as required of an OR indicator. © 1975, Psychonomic Society, Inc.. All rights reserved.