PMID: 4077744Jan 1, 1985

Forward masking of the auditory nerve neurophonic (ANN) and the frequency following response (FFR)

Hearing Research
R L Snyder, C E Schreiner

Abstract

The forward masking behavior of two averaged neurophonic responses was examined in cats. The auditory nerve neurophonic (ANN) was recorded with bipolar electrodes placed on the auditory nerve as it exits the internal meatus. The frequency following response (FFR) was recorded using scalp electrodes placed at the vertex and below the stimulated ear. Masking functions (response amplitude vs masker level) for frequencies both above and below the probe frequency were recorded. From these masking functions, 30% iso-depression contours (forward masking tuning curves, FMTCs) were constructed. The time course of the recovery from forward masking was also examined. It was found that the forward masking behavior of these neurophonics have many similarities to the behavior of other responses recorded using psychophysical and physiological methods. However, forward masking of the ANN and FFR has a number of unusual features. First, the best masking frequency (BMF), which in most forward masking studies is equal to the probe frequency, can be off-set from the probe frequency by as much as an octave. Second, the masker level at BMF can be as much as 30 dB below the probe level. Third, the magnitude of both of these off-sets is a function of ...Continue Reading

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