Offset tuning curves generated by simultaneous masking are more finely tuned than those generated by forward masking
Abstract
The rapid ending of a tone produces an evoked potential which has different properties than that which is produced by the sudden onset of a tone. At the level of the round window, the offset N1 N2 follows the ending of the cochlear microphonic (CM) by approximately the same amount of time as does the onset N1 N2 to the onset of the CM. Both onset and offset responses are abolished with cochlear lesion. Continuous masking was used to generate tuning curves (TCs) from the NI-PI component of the evoked potential recorded from the round window of the gerbil. Those evoked potentials generated in response to the tone onset were complementary in appearance to those generated in response to the tone offset. TCs generated by continuous masking of the NI-PII component of the auditory brainstem response (ABR) of the gerbil show the same pattern. When it is generated by simultaneous masking, the midfrequency offset TC in the gerbil and mouse is W-shaped. It has two well tuned tips which occur at frequencies below and above that of the probe stimulus used to generate the TC. It also has an even better tuned peak occurring at or slightly above the probe stimulus frequency, which becomes sharper as the masker sound pressure level (SPL) is inc...Continue Reading
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