Abstract
A study of the effect of random background noise on the intensive difference limen (DL) for pure tones was made by a method similar to that developed by Riesz. Three frequencies (250, 1000, and 4000 cps) at three sensation levels (20, 40, and 60 db) were studied, with signal-to-noise ratios of −15, −10, 0, and 10 db present for each condition. Analysis of the data revealed only signal-to-noise ratio as a significant factor affecting the DL. Repetition of the experiment with the psychophysical method of average error, for a 1000-cps signal at levels of 10, 30, 50, and 70 db, and signal-to-noise ratios of −10, 0, 10, and 20 db resulted in a lack of systematic shift of the difference limen. The curve relating the difference limen obtained by modulation to signal-to-noise ratio appears to parallel that found in quiet when the difference limen is plotted against sensation level. Some hypotheses relating to the differences of psychophysical procedure are stated.
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