Tonotopic Organization (Maps)

2012 ◽  
Keyword(s):  
Tonotopic Organization

scholarly journals Evidence of a Tonotopic Organization of the Auditory Cortex in Cochlear Implant Users

2007 ◽  
Vol 27 (29) ◽  
pp. 7838-7846 ◽  
Author(s):  
J. Guiraud ◽  
J. Besle ◽  
L. Arnold ◽  
P. Boyle ◽  
M.-H. Giard ◽  
...  
Keyword(s):  
Auditory Cortex ◽  
Cochlear Implant ◽  
Tonotopic Organization

scholarly journals Mutation of Npr2 Leads to Blurred Tonotopic Organization of Central Auditory Circuits in Mice

PLoS Genetics ◽  
2014 ◽  
Vol 10 (12) ◽  
pp. e1004823 ◽  
Author(s):  
Cindy C. Lu ◽  
Xiao-Jie Cao ◽  
Samantha Wright ◽  
Le Ma ◽  
Donata Oertel ◽  
...  
Keyword(s):  
Tonotopic Organization

Tonotopic organization of human auditory association cortex

1994 ◽  
Vol 663 (1) ◽  
pp. 38-50 ◽  
Author(s):  
Selene Cansino ◽  
Samuel J. Williamson ◽  
Daniel Karron
Keyword(s):  
Association Cortex ◽  
Tonotopic Organization ◽  
Auditory Association Cortex

scholarly journals Tonotopic Organization over Levels of the Auditory System for Cat and Rat

1973 ◽  
Vol 54 (1) ◽  
pp. 284-284 ◽  
Author(s):  
B. M. Clopton ◽  
J. A. Winfield ◽  
F. J. Flammino ◽  
J. M. Miller
Keyword(s):  
Auditory System ◽  
Tonotopic Organization

Inferior colliculus. II. Development of tuning characteristics and tonotopic organization in central nucleus of the neonatal cat

1975 ◽  
Vol 38 (5) ◽  
pp. 1208-1216 ◽  
Author(s):  
L. M. Aitkin ◽  
D. R. Moore
Keyword(s):  
Inferior Colliculus ◽  
Tuning Curve ◽  
External Auditory Meatus ◽  
Auditory Pathway ◽  
Central Nucleus ◽  
Synaptic Density ◽  
Tonotopic Organization ◽  
Tuning Curves ◽  
Sharp Form ◽  
Cochlear Development

Tuning curves were measured for 65 units in the inferior colliculus of seven anesthetized kittens aged from 6 to 28 days. At 2 days of age the inferior colliculus was divisible into central, pericentral, and external nuclei. Evidence was found for broader tuning curves to occur in the pericentral nucleus compared with the central nucleus, as has been observed in the adult. The middle ear was filled with serous fluid to 6 days, while the external auditory meatus remained collapsed until 10 days. Central nucleus tuning curves in kittens were relatively flat with high thresholds. Best-frequency thresholds diminished from a mean of near 100 dB SPL at 6-11 days to near 50 dB in the adult. The marked drop in thresholds between days 22 and 21 led to the adoption of the sharp form of tuning curve common for adults. Tonotopic organization of the central nucleus was clear at day 11. Speculations were advanced about the dependence of central auditory maturations on cochlear development, axon myelination in the auditory pathway, and changes in synaptic density as a function of age.

Functional Anatomy of the Human Cochlear Nerve and Its Role in Microvascular Decompressions for Tinnitus

Neurosurgery ◽  
2004 ◽  
Vol 54 (2) ◽  
pp. 381-390 ◽  
Author(s):  
Dirk De Ridder ◽  
Hiroshi Ryu ◽  
Aage R. Møller ◽  
Vicky Nowé ◽  
Paul Van de Heyning ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Microvascular Decompression ◽  
Functional Anatomy ◽  
Cochlear Nerve ◽  
Vascular Compression ◽  
Hearing Improvement ◽  
Posterior Aspect ◽  
Vestibulocochlear Nerve ◽  
Low Frequencies ◽  
Tonotopic Organization

Abstract OBJECTIVE The functional anatomy (i.e., tonotopy) of the human cochlear nerve is unknown. A better understanding of the tonotopy of the central nervous system segment of the cochlear nerve and of the pathophysiology of tinnitus might help to ameliorate the disappointing results obtained with microvascular decompressions in patients with tinnitus. METHODS We assume that vascular compression of the cochlear nerve can induce a frequency-specific form of hearing loss and that when the nerve is successfully decompressed, this hearing loss can recuperate. Thirty-one patients underwent a microvascular decompression of the vestibulocochlear nerve for vertigo or tinnitus. Preoperative audiograms were subtracted from postoperative audiograms, regardless of the surgical result with regard to the tinnitus and vertigo, because the hearing improvement could be the only sign of the vascular compression. The frequency of maximal improvement was then correlated to the site of vascular compression. A tonotopy of the cochlear nerve was thus obtained. RESULTS A total of 18 correlations can be made between the site of compression and postoperative maximal hearing improvement frequency when 5-dB hearing improvement is used as threshold, 13 when 10-dB improvement is used as threshold. A clear distribution can be seen, with clustering of low frequencies at the posterior and inferior side of the cochlear nerve, close to the brainstem, and close to the root exit zone of the facial nerve. High frequencies are distributed closer to the internal acoustic meatus and more superiorly along the posterior aspect of the cochlear nerve. CONCLUSION The tonotopic organization of the cisternal segment of the cochlear nerve has an oblique rotatory structure as a result of the rotatory course of the cochlear nerve in the posterior fossa. Knowledge of this tonotopic organization of the auditory nerve in its cisternal course might benefit surgeons who perform microvascular decompression operations for the vestibulocochlear compression syndrome, especially in the treatment of unilateral severe tinnitus.

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