Training in ABR

Comparison of 1 kHz and 4 kHz ABR using tone bursts and narrowband CE-Chirp® stimuli

10 mins
07 February 2022


Summary of: Ferm, I., Lightfoot, G., & Stevens, J. (2013). Comparison of ABR response amplitude, test time, and estimation of hearing threshold using frequency specific chirp and tone pip stimuli in newbornsInternational journal of audiology52(6), 419–423.

This study evaluates the performance of the narrow-band CE-Chirp stimuli centred at 4 kHz and 1 kHz in a real-world clinical setting. The study was designed such that infants referred by the UK newborn hearing screen for ABR testing were first assessed using conventional tone burst stimuli at 4 kHz and 1 kHz, before repeating the procedure with the CE-Chirp stimuli. Key aspects of the performance were then compared i.e. response amplitude, Fmp (an objective indication of the likelihood of a response being present) and residual noise. The results from 42 infant ears showed that the mean ABR amplitudes to both 4 kHz and 1 kHz CE-Chirp stimuli, when compared to those from equivalent tone burst stimuli at the same level and comparable residual noises, were 64% greater. Fmp values for the CE-Chirp data were over twice as large as the corresponding tone burst data. Taken together these results indicate that CE-Chirp derived ABRs will offer significant time savings when testing infants, while the great Fmp values provide increased confidence in the presence of a response and this should translate into fewer “inconclusive” findings. Since the larger amplitude CE-Chirp responses will therefore lead to clear responses at lower levels than tone bursts, a more accurate estimation of the behavioural threshold is also proposed (i.e. an nHL-to-eHL correction factor that is 5 dB less for CE-Chirps than tone burst at 4 kHz and 1 kHz).

Related course: An Introduction to the CE-Chirp®


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