Masking of Tones by Noise for the Cat

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Abstract
Masked thresholds were obtained by the method of behavioral audiometry for each of 4 cats at 11 frequencies, from 125 -16,000 cps. Bands of noise approximately 1-2 octaves wide and broad bands of noise were used as masking stimuli. The function relating masking to noise level has the same form for the cat as for man; the signal-to-noise ratios, however, are greater for the cat than for man. The critical ratio is defined as the ratio of signal power to spectrum level at the masked threshold. The function relating this to frequency for the cat parallels that for man, but lies 4 - 5 dB above it at most frequencies. The masking data for the cat are consistent with meas-urements of frequency discrimination for this animal.

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