Using a Concha Electrode to Measure Response Patterns Based on the Amplitudes of Cochlear Microphonic Waveforms Across Acoustic Frequencies in Normal-Hearing Subjects

Abstract

We confirmed a measurable CMW response pattern using the concha electrode. We propose that the pattern's features may be partly due to variation along the cochlea of the activities and volume of hair cells and possibly also the physical properties of the basilar membrane. The clinical importance of these results may be related mainly to seven features of the CMW, including electrode locations, response patterns, inclusion of low frequencies, and uniqueness of CMWs (versus otoacoustic emissions, auditory brainstem responses, shorter stimulus, and audiograms). Limitations, such as signal to noise ratio, also exist. After further study, the concha electrode may be used in the clinic and in research, and the response pattern may be used to interpret the CMW measurement.

The relationship between round window and ear canal Cochlear microphonic

“…Recently there has been great interest in non‐invasive recording of CM, such as ear canal recording, mastoid recording and concha recording 28,29 . In ear canal recording, primary electrode is placed on skin surface that is close to tympanic membrane 30,31 .…”

“…Recently there has been great interest in non‐invasive recording of CM, such as ear canal recording, mastoid recording and concha recording. 28 , 29 In ear canal recording, primary electrode is placed on skin surface that is close to tympanic membrane. 30 , 31 Although the amplitude of CM‐EC is about four times smaller than that by trans‐tympanic recording, ear canal recording can be easily performed by an audiologist without any injury to patient, and it does not require a topical anesthetic which is needed in trans‐tympanic recording.…”

Quantifying the Contribution of Peripheral Filtering to Auditory Sensitivity Using Cochlear Microphonic

“…However, it has been argued that the cochlea also makes ac rucial contribution [3]. Therefore, the contribution of the peripheral filtering to the auditory sensitivity wasexplored in this study.Because the cochlear microphonic (CM) is au seful analytical tool to characterize the performance of the auditory periphery [4] and is increasingly being used in auditory researches [5,6], the steady-state responses of the CM in guinea pigs were measured and corrected in this work. Ac orrected equal-CM curvew as obtained from the interpolation and extrapolation of the corrected CM curves.…”