Simultaneous multiple stimulation of the ASSR

10 mins
12 August 2022


This paper describes some characteristics of the ASSR related to the use of multiple, simultaneous, band-limited chirp-stimuli. In a diagnostic study four one-octave-band chirp-stimuli (500, 1000, 2000 and 4000 Hz) were used to measure the ASSR-threshold in normal-hearing adults (N=20 ears). The four stimuli were presented simultaneously to both ears (eight stimuli) with rates at around 90/s. The ASSRs were detected automatically (error rate 5%), and the thresholds evaluated with a resolution of 5 dB. The ASSR thresholds were compared to the audiometric pure-tone thresholds and the deviations evaluated by the group means and standard deviations. These data compare favorably well with similar data reported by others. In a screening study a low-frequency chirp, (Lo: 180 – 1500 Hz) and a high-frequency chirp (Hi: 1500 –8000 Hz), is used to record the ASSR in newborns (N = 72). The two stimuli are presented both sequentially and simultaneously using a rate at about 90/s and a level of 35 dB nHL. The ASSRs are detected automatically (error rate 0.1%), and stimulus efficiency is evaluated by the detection time. The results from both studies demonstrate that simultaneous application of multiple, frequency-specific stimuli can effectively be applied without sacrificing response detection accuracy. However, in the screening study stimulus interactions are observed.



Popular Academy Advancements

Interacoustics - hearing and balance diagnosis and rehabilitation
Copyright © Interacoustics A/S. All rights reserved.