A utricular origin of frequency tuning to low-frequency vibration in the human vestibular system?
Section snippets
Acknowledgements
We thank Sendhil Govender for assistance in data collection. This work was supported by the National Health and Medical Research Council of Australia and the Garnett Passe and Rodney Williams Foundation.
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2019, Clinical NeurophysiologyCitation Excerpt :The same frequency tuning changes have also been noted with oVEMPs (Singh and Barman, 2016). With regards to the frequency sensitivity itself, it is suggested that the phenomenon of frequency tuning in the vestibular end organs may be a result of an electrical resonance intrinsic to the hair cells (Ashmore, 1983; Todd et al., 2009). It is usually assessed by performing both c- and oVEMPs in the standard way, but separately using two different sound frequencies, namely 500 Hz and 1 kHz.
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2017, Clinical NeurophysiologyCitation Excerpt :It was also shown that the afferent units have a tuning curve after ACS and BCV with maximal responses between 500 and 1000 Hz (Curthoys et al., 2006, 2016; McCue and Guinan, 1994; Murofushi and Curthoys, 1997; Young et al., 1977). Although it was demonstrated that the responses also show tuning curves (Chihara et al., 2009; Park et al., 2010; Rauch et al., 2004; Taylor et al., 2012; Todd et al., 2000, 2009; Welgampola and Colebatch, 2001; Zhang et al., 2011) and the responses tend to occur spaced by 2 ms after stimulation with 500 Hz tone bursts (Lim et al., 2013), the effect of the stimulus phase in humans, however, is not as clear. Until this study was written, Govender et al. (2016a) were the only authors to the best of our knowledge who formally described the effect of ACS stimulus polarity in humans and, contrary to what would be expected from the animal studies, they did not find significant differences in latencies or amplitude of the responses.
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