Abstract
Frequency DL's at 1000 Hz were obtained in quiet and at three noise levels—60, 80, and 100 dB SPL. Sensation levels of 4, 6, and 10 dB SL were used at each noise level. The DL's were obtained by means of a tracking task in which the subject controlled the input voltage to a frequency modulator. Characteristic improvement is seen when frequency DL's are plotted as a function of sensation level. The curve for the DL's for 60-dB SPL noise runs parallel to the curve for quiet, with the noise DL's slightly greater. The curves for the DL's for the 80- and 100-dB SPL noises are less steep, and the average DL's are greater than the DL's for quiet by ratios of 1.5:1 and 2:1, respectively. [This research was supported by research grants from the National Institute of Neurological Diseases and Blindness, U. S. Public Health Service.]
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