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Abstract
Vestibular hearing in human is evoked as a result of the auditory sensitivity of the saccule to low-frequency high-intensity tone. The objective was to investigate the relationship between vestibular hearing using cervical vestibular-evoked myogenic potentials (cVEMPs) and speech processing via word recognition scores in white noise (WRSs in wn). Intervention comprised of audiologic examinations, cVEMPs, and WRS in wn. All healthy subjects had detectable cVEMPs (safe vestibular hearing). WRSs in wn were obtained for them (66.9 ± 9.3% in the right ears and 67.5 ± 11.8% in the left ears). Dizzy patients in the affected ears, had the cVEMPs abnormalities (insecure vestibular hearing) and decreased the WRS in wn (51.4 ± 3.8% in the right ears and 52.2 ± 3.5% in the left ears). The comparison of the cVEMPs between the subjects revealed significant differences (P < 0.05). Therefore, the vestibular hearing can improve the speech processing in the competing noisy conditions.
Highlights
CVEMPs provide a means of assessing otolith function
The case group was twenty two dizzy patients selected from subjects who presented with the complaint of disequilibrium (14 females and 8 males, mean age 32 years and range 20–39 years), which diagnosed with benign paroxysmal positional vertigo, migraineur, and psychogenic causes
The exclusion criteria was the history of ear infections and middle ear diseases, which could interfere with cervical vestibular-evoked myogenic potentials (cVEMPs), Distortion Product Otoacoustic Emissions (DPOAEs), and Impedance Acoustic (IA) measurements
Summary
CVEMPs provide a means of assessing otolith function. Stimulation of the vestibular system with air-conducted sound activates predominantly saccular afferents, Wu and Young [1], Curthoys et al [2], and Wang et al [3]. The saccular afferents may give rise to a response in stapedius This evidence suggests that the saccule retains an ability to trigger acoustic reflexes of certain muscles in man, which may serve an “antimasking” function of low frequency on high-frequency-tones, Rosengren et al [11] and Sheykholeslami and Kaga [9]. The olivocochlear efferent system during stapedial reflex acts to extend dynamic range; this feedback system can be expected to exert a greater effect on the representation of speech to loud sounds in human It can improve the representation of spectral shape and speech perception at high stimulus levels, Todd et al [7], Sheykholeslami and Kaga [9], and Curthoys et al [2]. The averaged values less than 3 dB were omitted from the analyses, Mukari and Mamat [15]
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