Abstract
Observations were made on guinea pig with intracochlear electrodes. Successive waves of low-frequency stimulation set off well-synchronized volleys of action potentials (AP) as well as the familiar cochlear microphonic (CM). The phenomenon of masking of a 500 cps tone pip is, of course, observed when a low-frequency band of noise, centered on 500 cps, obscures the CM and masks the AP that result from the pip. At comparable levels of stimulation, high-frequency band of noise centered on 6950 cps and having no appreciable energy in the 500 cps region will not mask. But, as the intensity of the high-frequency sound is raised to high levels, masking occurs. A random, low-frequency CM now appears in the apical region in addition to the expected high-frequency CM response in the basal turn. We infer that the ear responds nonlinearly to the high-level noise and “detects” its envelope as random low frequencies of random amplitude. This anomalous masking is produced both by a band of noise and by a high-frequency tone which is amplitude modulated by a low frequency.
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