Abstract
Initiation sites of the frequency following potential (FFP) along the cochlear partition have been thought to be dependent upon stimulus SPL. However, information regarding initiation sites of the FFP have come from simultaneous masking studies, and results from these studies may be confounded by interference from bio‐electric potentials generated by distortion products of the masking stimulus. This study used a series of forward masking tone bursts set at the subjects' pulsation threshold level (PTL) to establish physiologic tuning patterns for a 500‐Hz tone burst at 80 and 100 dB SPL. Tuning patterns for these levels were determined during the presence or absence of continuous high‐pass noise masking. Results from this study revealed selective FFP amplitude reduction by forward masking stimuli of 500 Hz as well as maskers up to 2000 Hz. Tuning patterns were consistently broader for the higher stimulus levels. These findings suggest multiple cochlear initiation sites for the FFP and do not support its use as an audiologic tool for low‐frequency hearing assessment.
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