Intensity Discrimination Thresholds under Several Psychophysical Procedures

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Abstract
Discrimination thresholds for the detection of a change in the sound level of a tone were obtained under 5 experimental procedures. These procedures differed primarily in terms of the presence or absence of an objective comparison signal and in terms of the stability of the test conditions under examination. Under comparable conditions, discrimination in the absence of an objective comparison signal is only slightly less acute than in the presence of such a signal. On the other hand, relatively large increments in the detection thresholds are associated with increases in the instability of the testing conditions, especially over long discrimination intervals. Results are examined in terms of molar concepts more pertinent to the listener than to the ear.

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