Vestibular Hearing and Speech Processing

Emami, Seyede Faranak; Pourbakht, Akram; Sheykholeslami, Kianoush; Kamali, Mohammad; Behnoud, Fatholah; Daneshi, Ahmad

doi:10.5402/2012/850629

Cited by 14 publications

(15 citation statements)

References 25 publications

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“…However, the presence of a vestibular component in cortical potentials from the temporal lobe, hitherto considered purely cochlear in origin, also raises the possibility that acoustic activation of the otolith organs could contribute to auditory discrimination. There is now a growing literature which provides evidence of a central vestibular–auditory interaction which allows vestibular inputs to improve temporal and spatial aspects of hearing ( Emami and Daneshi, 2012; Brimijoin and Akeroyd, 2012; Probst and Wist, 1990 ) and to contribute to speech perception and in metrical aspects of musical perception ( Emami et al., 2012; Phillips-Silver and Trainor, 2008 ). Given the well-established cross-over from vestibular to auditory pathways at the level of the brainstem (e.g.…”

Section: Discussionmentioning

confidence: 99%

Source analysis of short and long latency vestibular-evoked potentials (VsEPs) produced by left vs. right ear air-conducted 500 Hz tone pips

et al. 2014

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Todd et al. (2014) have recently demonstrated the presence of vestibular dependent changes both in the morphology and in the intensity dependence of auditory evoked potentials (AEPs) when passing through the vestibular threshold as determined by vestibular evoked myogenic potentials (VEMPs). In this paper we extend this work by comparing left vs. right ear stimulation and by conducting a source analysis of the resulting evoked potentials of short and long latency. Ten healthy, right-handed subjects were recruited and evoked potentials were recorded to both left- and right-ear sound stimulation, above and below vestibular threshold. Below VEMP threshold, typical AEPs were recorded, consisting of mid-latency (MLR) waves Na and Pa followed by long latency AEPs (LAEPs) N1 and P2. In the supra-threshold condition, the expected changes in morphology were observed, consisting of: (1) short-latency vestibular evoked potentials (VsEPs) which have no auditory correlate, i.e. the ocular VEMP (OVEMP) and inion response related potentials; (2) a later deflection, labelled N42/P52, followed by the LAEPs N1 and P2. Statistical analysis of the vestibular dependent responses indicated a contralateral effect for inion related short-latency responses and a left-ear/right-hemisphere advantage for the long-latency responses. Source analysis indicated that the short-latency effects may be mediated by a contralateral projection to left cerebellum, while the long-latency effects were mediated by a contralateral projection to right cingulate cortex. In addition we found evidence of a possible vestibular contribution to the auditory T-complex in radial temporal lobe sources. These last results raise the possibility that acoustic activation of the otolith organs could potentially contribute to auditory processing.

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Section: Discussionmentioning

confidence: 99%

Source analysis of short and long latency vestibular-evoked potentials (VsEPs) produced by left vs. right ear air-conducted 500 Hz tone pips

et al. 2014

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“…Because the neurons at the brainstem and primary auditory cortex are responsive to the low-frequencies [ 22 ] human saccule is activated by low-frequency sounds and sends effective acoustic information to the central auditory system. It should allow for sufficient speech coding for intelligibility assums connectivity to the auditory neuraxis [ 23 ].…”

Section: Discussionmentioning

confidence: 99%

“…Such sounds are usually heard during neural synchronization. It is likely that increased synchronization of auditory cortical neurons will similarly enhance the transmission of information to subsequent stages in auditory processing [ 23 ]. Then, low-frequency components, which can stimulate saccular afferents as important contributors in the neural phenomenons and may serve as the basis for hierarchical synchronization function through which the central nervous system processes and integrates sensory information [ 25 ].…”

Section: Discussionmentioning

confidence: 99%

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Sound Sensitivity of the Saccule for Low Frequencies in Healthy Adults

Emami

Pourbakht

Daneshi

et al. 2013

ISRN Otolaryngology

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Approximately 80 years ago John Tait speculated about a possible auditory role for the otolith organs in humans those days, there was no direct evidence for that idea. This time is for us to review and research. Then, the objective of our study was to investigate saccular hearing in healthy adults. We selected twenty healthy controls and twenty-four dizzy cases. Assessment comprised of audiologic evaluations, cervical vestibular evoked myogenic potentials (cVEMPs), and recognition of spoken phonemes in white noise (Rsp in wn). In the case group (a total of 48 ears), the cVEMPs abnormalities were all unilateral (24 affected ears and 24 contralateral unaffected ears). Affected ears with decreased vestibular excitability as detected by abnormal cVEMPs had decreased Rsp in wn (mean = 60.78 ± 8.33), whereas both unaffected (mean = 96.24 ± 2.4) and control ears (mean = 96.24 ± 2.4) presented normal results. The correlation between RSP in wn and p13 latencies was significant (P < 0.05, r = −0.551). The peak-to-peak amplitudes showed significant correlation to RSP in wn (P < 0.05, r = 0.307). The correlation between RSP in wn and the latencies of n23 was significant (P < 0.05, r = −0.493). We concluded in presence of severe competing noise, saccule has a facilitating role for cochlea and can improve to detection of loud low-frequencies.

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“…Previous study have established that vestibular hearing might be used to assist in the rehabilitation of hearing loss and deafness [3]. Thus, the vestibular hearing can improve the speech processing in the competing noisy conditions, and it can contribute to frequency discrimination of loud tone, and improve speech perception [11]. The range of vestibular hearing happens in the range of the fundamental ( F 0 ) frequency and exceeds that of the cochlea for low frequencies [7].…”

Section: Introductionmentioning

confidence: 99%

Vestibular Hearing and Neural Synchronization

Emami

Daneshi

2012

ISRN Otolaryngology

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Objectives. Vestibular hearing as an auditory sensitivity of the saccule in the human ear is revealed by cervical vestibular evoked myogenic potentials (cVEMPs). The range of the vestibular hearing lies in the low frequency. Also, the amplitude of an auditory brainstem response component depends on the amount of synchronized neural activity, and the auditory nerve fibers' responses have the best synchronization with the low frequency. Thus, the aim of this study was to investigate correlation between vestibular hearing using cVEMPs and neural synchronization via slow wave Auditory Brainstem Responses (sABR). Study Design. This case-control survey was consisted of twenty-two dizzy patients, compared to twenty healthy controls. Methods. Intervention comprised of Pure Tone Audiometry (PTA), Impedance acoustic metry (IA), Videonystagmography (VNG), fast wave ABR (fABR), sABR, and cVEMPs. Results. The affected ears of the dizzy patients had the abnormal findings of cVEMPs (insecure vestibular hearing) and the abnormal findings of sABR (decreased neural synchronization). Comparison of the cVEMPs at affected ears versus unaffected ears and the normal persons revealed significant differences (P < 0.05). Conclusion. Safe vestibular hearing was effective in the improvement of the neural synchronization.

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Vestibular Hearing and Speech Processing

Cited by 14 publications

References 25 publications

Source analysis of short and long latency vestibular-evoked potentials (VsEPs) produced by left vs. right ear air-conducted 500 Hz tone pips

Source analysis of short and long latency vestibular-evoked potentials (VsEPs) produced by left vs. right ear air-conducted 500 Hz tone pips

Sound Sensitivity of the Saccule for Low Frequencies in Healthy Adults

Vestibular Hearing and Neural Synchronization

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