Cochlear initiation sites of the frequency following potential.

This study used a series of non-simultaneous masking stimuli set at subjects' pulsation threshold (PT) level to deduce frequency following potential (FFP) tuning curves for 500-Hz tone bursts at 80 and 100 dB SPL. PT and FFP tuning curves were determined in the presence and absence of continuous high-pass masking noise. Results from study demonstrated differences in FFP tuning curves, depending on the high-pass masking condition. High-frequency end of FFP tuning curve was diminished in the presence of high-pass masking noise. These findings suggested that higher frequency tone bursts were less effective in diminishing FFP amplitude when basal end of cochlea was masked. Findings suggest that cochlear initiation site of FFP extends beyond the apical turn of the cochlea at moderate and high intensity levels. A limited clinical use for FFP is suggested.