Functional asymmetries of crossed and uncrossed medial olivocochlear efferent pathways in humans

Philibert, Bénédicte; Veuillet, E.; Collet, Lionel

doi:10.1016/s0304-3940(98)00615-6

Cited by 40 publications

(26 citation statements)

References 12 publications

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“…Such a change could be associated with altered cortical activation patterns, including changes in top-down influences, as reflected in MOCB activity. Although this interpretation is highly speculative, it merits additional investigation, given the strong similarities between our findings and those of Veuillet and coworkers and the suggested link between MOCB asymmetry and cerebral speech lateralization (Philibert et al, 1998;MorandVilleneuve et al, 2005).…”

Section: Mocb and Categorical Perceptionsupporting

confidence: 59%

Neural Correlates of Perceptual Learning in the Auditory Brainstem: Efferent Activity Predicts and Reflects Improvement at a Speech-in-Noise Discrimination Task

Boer¹,

Thornton²

2008

J. Neurosci.

182

170

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An extensive corticofugal system extends from the auditory cortex toward subcortical nuclei along the auditory pathway. Corticofugal influences reach even into the inner ear via the efferents of the olivocochlear bundle, the medial branch of which modulates preneural sound amplification gain. This corticofugal system is thought to contribute to neuroplasticity underlying auditory perceptual learning. In the present study, we investigated the involvement of the medial olivocochlear bundle (MOCB) in perceptual learning as a result of auditory training. MOCB activity was monitored in normal-hearing adult listeners during a 5 d training regimen on a consonant-vowel phoneme-in-noise discrimination task. The results show significant group learning, with great inter-individual variability in initial performance and improvement. As observed in previous auditory training studies, poor initial performers tended to show greater learning. Strikingly, MOCB activity measured on the first training day strongly predicted the subsequent amount of improvement, such that weaker initial MOCB activity was associated with greater improvement. Moreover, in listeners that improved significantly, an increase in MOCB activity was observed after training. Thus, as discrimination thresholds of listeners converged over the course of training, differences in MOCB activity between listeners decreased. Additional analysis showed that MOCB activity did not explain variation in performance between listeners on any training day but rather reflected an individual listener's performance relative to their personal optimal range. The findings suggest an MOCB-mediated listening strategy that facilitates speech-in-noise perception. The operation of this strategy is flexible and susceptible to training, presumably because of task-related adaptation of descending control from the cortex.

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Section: Mocb and Categorical Perceptionsupporting

confidence: 59%

Neural Correlates of Perceptual Learning in the Auditory Brainstem: Efferent Activity Predicts and Reflects Improvement at a Speech-in-Noise Discrimination Task

Boer¹,

Thornton²

2008

J. Neurosci.

182

170

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“…It is well known that the auditory system is asymmetrically organized in righthanded subjects, at both central and peripheral levels. Studies exploring the medial olivocochlear eVerent system, thought to have a protective role, have shown it to have more eVect on REs than on LEs in right-handed listeners (Khalfa and Collet, 1996;Khalfa et al, 1998;Philibert et al, 1998). DiVerences in sensitivity to tinnitus between ears were also reported, tinnitus more often aVecting LEs than REs (Axelsson and Ringdahl, 1989).…”

Section: Electrophysiological Recordingsmentioning

confidence: 98%

The auditory acclimatization effect in sensorineural hearing-impaired listeners: Evidence for functional plasticity

et al. 2005

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“…This suppressive effect on outer hair cells improves speech-in-noise intelligibility (Giraud et al, 1997) because it enhances the dynamic range of primary auditory neurons (Micheyl and Collet, 1996;Kumar and Vanaja, 2004). The efferent effect is known to be lateralized, stronger in the right than the left ear (Khalfa et al, 1997;Philibert et al, 1998), and has accordingly been suggested to be part of the so called "right ear advantage" (Bilger et al, 1990;Kei et al, 1997;Khalfa et al, 1997;Newmark et al, 1997;Keogh et al, 2001). Noise is especially effective in eliciting this crossed efferent effect and, consequently, in the monaural speech condition with noise in the other ear, there is a systematic contralateral suppression of the neural response to the speech signal.…”

Section: Possible Influence Of Cochlear Efferents In Dichotic Effectsmentioning

confidence: 99%

Brain–Speech Alignment Enhances Auditory Cortical Responses and Speech Perception

Saoud

Josse²,

Bertasi³

et al. 2012

J. Neurosci.

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Asymmetry in auditory cortical oscillations could play a role in speech perception by fostering hemispheric triage of information across the two hemispheres. Due to this asymmetry, fast speech temporal modulations relevant for phonemic analysis could be best perceived by the left auditory cortex, while slower modulations conveying vocal and paralinguistic information would be better captured by the right one. It is unclear, however, whether and how early oscillation-based selection influences speech perception. Using a dichotic listening paradigm in human participants, where we provided different parts of the speech envelope to each ear, we show that word recognition is facilitated when the temporal properties of speech match the rhythmic properties of auditory cortices. We further show that the interaction between speech envelope and auditory cortices rhythms translates in their level of neural activity (as measured with fMRI). In the left auditory cortex, the neural activity level related to stimulus-brain rhythm interaction predicts speech perception facilitation. These data demonstrate that speech interacts with auditory cortical rhythms differently in right and left auditory cortex, and that in the latter, the interaction directly impacts speech perception performance.

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Functional asymmetries of crossed and uncrossed medial olivocochlear efferent pathways in humans

Cited by 40 publications

References 12 publications

Neural Correlates of Perceptual Learning in the Auditory Brainstem: Efferent Activity Predicts and Reflects Improvement at a Speech-in-Noise Discrimination Task

Neural Correlates of Perceptual Learning in the Auditory Brainstem: Efferent Activity Predicts and Reflects Improvement at a Speech-in-Noise Discrimination Task

The auditory acclimatization effect in sensorineural hearing-impaired listeners: Evidence for functional plasticity

Brain–Speech Alignment Enhances Auditory Cortical Responses and Speech Perception

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