Abstract
A theory as to the operation of the cochlea and with consideration as to the role of the scala tympani, has been proposed: This “two-canal” theory offers a possible explanation for a number of auditory effects. The variation in loudness level with intensity level at different frequencies may be due to the appearance of “repeat points” both at the low and high frequency portions of the acoustical spectrum. For steady-state tones, the phenomenon of masking can be attributed to the appearance of these “repeat points,” without requiring marked departures from linearity in the auditory transmission links to the cochlea. Certain phase effects encountered for steady-state stimuli require that the cochlea, following the Helmholtz resonant theory, should display low damping. On the other hand, observational data on the masking effects of clicks and other transient stimuli both on steady tones and on other impulsive stimuli require that the cochlea response be highly damped. The “two-canal” theory provides an explanation for this apparent inconsistency by providing for a highly damped but sharply frequency-selective mechanism.
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