T. K. Parthasarathy
Dept. of Speech Pathol. and Audiol., Southern Illinois Univ., Edwardsville, IL 62026 Central Inst. for the Deaf, St. Louis, MO 63110
The effects of click repetition rate and phase on wave I and V latency of the auditory brain-stem response (ABR) were evaluated in ten male and female normal hearing subjects. Clicks were presented monaurally via an insert earphone at 70 dB nHL, using either a condensation (C), a rarefaction (R), or a alternating (Alt) stimuli at two rates, 11.1 and 61.1/s. Females had shorter absolute (V) and interpeak latencies (I--V) than the males. These sex-related latency differences were phase independent. Furthermore, the stimulus phase effect on ABR latencies (I and V) were insignificant. Increasing the repetition rate produced greater wave I and V latency shifts for C and Alt clicks than the R clicks. Results seem to suggest significant rate-phase interaction effects on ABR latencies (I and V). However, the phase-sex and the rate-sex interaction effects on ABR latencies (I and V) were insignificant.