The Effect of Different Stimulation Rates on Brainstem Auditory-Evoked-Potential Responses

Area of Science:

• Neuroscience
• Audiology
• Evoked Potentials

Background:

• Auditory-evoked potentials (AEPs) are crucial diagnostic tools influenced by various parameters, including stimulation rate.
• Higher stimulation rates in AEP testing reduce overall test time but can alter wave morphology and amplitude.
• Optimizing stimulation rate is essential for balancing efficiency and data quality in clinical auditory assessments.

Purpose of the Study:

• To compare brainstem auditory-evoked potential (BAEP) responses using click stimuli across common clinical stimulation rates.
• To evaluate the impact of different stimulation rates on wave morphology, amplitude, and latency in normal-hearing individuals.

Main Methods:

• A cross-sectional analytical study involving fifteen participants with normal hearing thresholds.
• BAEPs were recorded using click stimuli at four distinct rates: 21.1, 26.7, 27.7 stimuli/s, and a rate derived from local power grid frequency.
• Analysis focused on comparing wave amplitudes, latencies, and overall morphology across the tested stimulation rates.

Main Results:

• The stimulation rate of 21.1 stimuli/s yielded the highest amplitudes for waves I, III, and V compared to other rates.
• Wave V amplitude was greater at 26.7 stimuli/s than at 27.7 stimuli/s, and wave V latency was significantly lower at 21.1 stimuli/s versus 27.7 stimuli/s.
• Adjusting the stimulation rate based on local power grid frequency showed potential for improving wave III visualization.

Conclusions:

• Stimulation rate significantly impacts BAEP wave latencies and amplitudes.
• Decreasing the stimulation rate from 27.7 to 21.1 stimuli/s enhances wave amplitudes (I, III, V), improves wave morphology, and reduces wave V latency.
• Optimizing stimulation rate, potentially by synchronizing with local power grid frequency, can improve diagnostic clarity of BAEPs.