Corticofugal modulation of the midbrain frequency map in the bat auditory system

10.1038/255 ◽  
1998 ◽  
Vol 1 (1) ◽  
pp. 54-58 ◽  
Author(s):  
Wei Yan ◽  
Nobuo Suga
Keyword(s):  
Auditory System ◽  
Frequency Map ◽  
Corticofugal Modulation

scholarly journals Brief and Short-Term Corticofugal Modulation of Subcortical Auditory Responses in the Big Brown Bat, Eptesicus fuscus

2000 ◽  
Vol 84 (6) ◽  
pp. 3083-3087 ◽  
Author(s):  
Xiaoming Zhou ◽  
Philip H.-S. Jen
Keyword(s):  
Signal Processing ◽  
Inferior Colliculus ◽  
Auditory System ◽  
Central Nucleus ◽  
Short Term ◽  
Auditory Responses ◽  
Big Brown Bat ◽  
Auditory Experience ◽  
Frequency Map ◽  
Corticofugal Modulation

Recent studies show that the auditory corticofugal system modulates and improves ongoing signal processing and reorganizes frequency map according to auditory experience in the central nucleus of bat inferior colliculus. However, whether all corticofugally affected collicular neurons are involved in both types of modulation has not been determined. In this study, we demonstrate that one group (51%) of collicular neurons participates only in corticofugal modulation of ongoing signal processing, while a second group (49%) of collicular neurons participates in both modulation of ongoing signal processing and in reorganization of the auditory system.

scholarly journals Corticofugal modulation of frequency processing in bat auditory system

Nature ◽  
10.1038/43180 ◽  
1997 ◽  
Vol 387 (6636) ◽  
pp. 900-903 ◽  
Author(s):  
Yunfeng Zhang ◽  
Nobuo Suga ◽  
Jun Yan
Keyword(s):  
Auditory System ◽  
Corticofugal Modulation ◽  
Frequency Processing

Evaluation of Efferent Auditory System and Hearing Quality in Parkinson's Disease: Is the Difficulty in Speech Understanding in Complex Listening Conditions Related to Neural Degeneration or Aging?

2020 ◽  
pp. 1-9
Author(s):  
Nuriye Yıldırım Gökay ◽  
Bülent Gündüz ◽  
Fatih Söke ◽  
Recep Karamert
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Auditory System ◽  
Otoacoustic Emissions ◽  
Pure Tone ◽  
Pure Tone Audiometry ◽  
Auditory Pathway ◽  
Normal Hearing ◽  
System Function ◽  
Distortion Product

Purpose The effects of neurological diseases on the auditory system have been a notable issue for investigators because the auditory pathway is closely associated with neural systems. The purposes of this study are to evaluate the efferent auditory system function and hearing quality in Parkinson's disease (PD) and to compare the findings with age-matched individuals without PD to present a perspective on aging. Method The study included 35 individuals with PD (mean age of 48.50 ± 8.00 years) and 35 normal-hearing peers (mean age of 49 ± 10 years). The following tests were administered for all participants: the first section of the Speech, Spatial and Qualities of Hearing Scale; pure-tone audiometry, speech audiometry, tympanometry, and acoustic reflexes; and distortion product otoacoustic emissions (DPOAEs) and contralateral suppression of DPOAEs. SPSS Version 25 was used for statistical analyses, and values of p < .05 were considered statistically significant. Results There were no statistically significant differences in the pure-tone audiometry thresholds and DPOAE responses between the individuals with PD and their normal-hearing peers ( p = .732). However, statistically significant differences were found between the groups in suppression levels of DPOAEs and hearing quality ( p < .05). In addition, a statistically significant and positive correlation was found between the amount of suppression at some frequencies and the Speech, Spatial and Qualities of Hearing Scale scores. Conclusions This study indicates that medial olivocochlear efferent system function and the hearing quality of individuals with PD were affected adversely due to the results of PD pathophysiology on the hearing system. For optimal intervention and follow-up, tasks related to hearing quality in daily life can also be added to therapies for PD.

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