Cochlear nonlinearity: Implications for auditory signal processing and perception.

1996 ◽  
Vol 99 (4) ◽  
pp. 2582-2603
Author(s):  
Hendrikus Duifhuis
Keyword(s):  
Signal Processing ◽  
Auditory Signal ◽  
Auditory Signal Processing ◽  
Cochlear Nonlinearity

scholarly journals Modulation of thalamic auditory neurons by the primary auditory cortex

2012 ◽  
Vol 108 (3) ◽  
pp. 935-942 ◽  
Author(s):  
Jie Tang ◽  
Weiguo Yang ◽  
Nobuo Suga
Keyword(s):  
Signal Processing ◽  
Electric Stimulation ◽  
Frequency Tuning ◽  
Primary Auditory Cortex ◽  
Auditory Signal ◽  
Tuning Curves ◽  
Auditory Responses ◽  
Auditory Signal Processing ◽  
Plastic Changes ◽  
Stimulation Of

The central auditory system consists of the lemniscal and nonlemniscal pathways or systems, which are anatomically and physiologically different from each other. In the thalamus, the ventral division of the medial geniculate body (MGBv) belongs to the lemniscal system, whereas its medial (MGBm) and dorsal (MGBd) divisions belong to the nonlemniscal system. Lemniscal neurons are sharply frequency-tuned and provide highly frequency-specific information to the primary auditory cortex (AI), whereas nonlemniscal neurons are generally broadly frequency-tuned and project widely to cortical auditory areas including AI. These two systems are presumably different not only in auditory signal processing, but also in eliciting cortical plastic changes. Electric stimulation of narrowly frequency-tuned MGBv neurons evokes the shift of the frequency-tuning curves of AI neurons toward the tuning curves of the stimulated MGBv neurons (tone-specific plasticity). In contrast, electric stimulation of broadly frequency-tuned MGBm neurons augments the auditory responses of AI neurons and broadens their frequency-tuning curves (nonspecific plasticity). In our current studies, we found that electric stimulation of AI evoked tone-specific plastic changes of the MGBv neurons, whereas it degraded the frequency tuning of MGBm neurons by inhibiting their auditory responses. AI apparently modulates the lemniscal and nonlemniscal thalamic neurons in quite different ways. High MGBm activity presumably makes AI neurons less favorable for fine auditory signal processing, whereas high MGBv activity makes AI neurons more suitable for fine processing of specific auditory signals and reduces MGBm activity.

scholarly journals Bilateral Collicular Interaction: Modulation of Auditory Signal Processing in Amplitude Domain

PLoS ONE ◽  
2012 ◽  
Vol 7 (7) ◽  
pp. e41311 ◽  
Author(s):  
Hui-Xian Mei ◽  
Liang Cheng ◽  
Jia Tang ◽  
Zi-Ying Fu ◽  
Xin Wang ◽  
...  
Keyword(s):  
Signal Processing ◽  
Auditory Signal ◽  
Auditory Signal Processing

scholarly journals Blast Exposure Causes Long-Term Degeneration of Neuronal Cytoskeletal Elements in the Cochlear Nucleus: A Potential Mechanism for Chronic Auditory Dysfunctions

2021 ◽  
Vol 12 ◽  
Author(s):  
Peethambaran Arun ◽  
Franco Rossetti ◽  
Donna M. Wilder ◽  
Ying Wang ◽  
Irene D. Gist ◽  
...  
Keyword(s):  
Signal Processing ◽  
Cochlear Nucleus ◽  
Neuronal Degeneration ◽  
Brain Regions ◽  
Auditory Signal ◽  
Blast Exposure ◽  
Auditory Signal Processing ◽  
Medial Geniculate ◽  
Cytoskeletal Elements ◽  
The Brain

Blast-induced auditory dysfunctions including tinnitus are the most prevalent disabilities in service members returning from recent combat operations. Most of the previous studies were focused on the effect of blast exposure on the peripheral auditory system and not much on the central auditory signal-processing regions in the brain. In the current study, we have exposed rats to single and tightly coupled repeated blasts and examined the degeneration of neuronal cytoskeletal elements using silver staining in the central auditory signal-processing regions in the brain at 24 h, 14 days, 1 month, 6 months, and 1 year. The brain regions evaluated include cochlear nucleus, lateral lemniscus, inferior colliculus, medial geniculate nucleus, and auditory cortex. The results obtained indicated that a significant increase in degeneration of neuronal cytoskeletal elements was observed only in the left and right cochlear nucleus. A significant increase in degeneration of neuronal cytoskeletal elements was observed in the cochlear nucleus at 24 h and persisted through 1 year, suggesting acute and chronic neuronal degeneration after blast exposure. No statistically significant differences were observed between single and repeated blasts. The localized degeneration of neuronal cytoskeletal elements in the cochlear nucleus suggests that the damage could be caused by transmission of blast shockwaves/noise through the ear canal and that use of suitable ear protection devices can protect against acute and chronic central auditory signal processing defects including tinnitus after blast exposure.

Bilateral collicular interaction: Modulation of auditory signal processing in frequency domain

Neuroscience ◽  
2013 ◽  
Vol 235 ◽  
pp. 27-39 ◽  
Author(s):  
L. Cheng ◽  
H.-X. Mei ◽  
J. Tang ◽  
Z.-Y. Fu ◽  
P.H.-S. Jen ◽  
...  
Keyword(s):  
Signal Processing ◽  
Frequency Domain ◽  
Auditory Signal ◽  
Auditory Signal Processing

Descending system and plasticity for auditory signal processing: neuroethological data for speech scientists

2003 ◽  
Vol 41 (1) ◽  
pp. 189-200 ◽  
Author(s):  
Nobuo Suga ◽  
Xiaofeng Ma ◽  
Enquan Gao ◽  
Masashi Sakai ◽  
Syed A. Chowdhury
Keyword(s):  
Signal Processing ◽  
Auditory Signal ◽  
Auditory Signal Processing
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