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Multiparametric corticofugal modulation and plasticity in the auditory system
Recent progress is reviewed in understanding of the corticofugal system and the reorganization of the auditory system of the moustached bat.
Analysis of acoustic elements and syntax in communication sounds emitted by mustached bats.
- J. Kanwal, S. Matsumura, K. Ohlemiller, N. Suga
- PhysicsJournal of the Acoustical Society of America
- 1 September 1994
Temporal analysis of multisyllabic constructs reveals several syntactical rules for syllable transitions in Mustached bats, which exhibit a large intrinsic variation in their physical structure compared to the stereotypic echolocation pulses.
Experience-dependent plasticity in the auditory cortex and the inferior colliculus of bats: role of the corticofugal system.
The working hypothesis is that, during conditioning, the corticofugal system evokes subcortical BF shifts, which in turn boost cortical BF shifts which otherwise would be very small.
Experience-dependent corticofugal adjustment of midbrain frequency map in bat auditory system.
It is found that acoustic stimulation alone evokes a change in the frequency map of the IC, and this change becomes greater when the acoustic stimulation is made behaviorally relevant by pairing it with electrical stimulation, and that the collicular change is mediated by the corticofugal system.
Role of corticofugal feedback in hearing
- N. Suga
- Biology, PsychologyJournal of Comparative Physiology A
- 29 January 2008
The auditory system consists of the ascending and descending (corticofugal) systems and one of the most important functions is the improvement and adjustment of subcortical auditory signal processing for cortical signal processing.
Corticofugal modulation of frequency processing in bat auditory system
The corticofugal system mediates a positive feedback which, in combination with widespread lateral inhibition, sharpens and adjusts the tuning of neurons at earlier stages in the auditory processing pathway.
Corticofugal modulation of the midbrain frequency map in the bat auditory system
One role of the mammalian corticofugal system may be to modify subcortical sensory maps in response to sensory experience, as investigated in the big brown bat.
Combination-sensitive neurons in the medial geniculate body of the mustached bat: encoding of target range information.
The examination of the response properties of FM-FM neurons indicates that the neural mechanism of delay-tuning depends on coincidence detection and involves an interaction between neural inhibition and excitation, and evidence for a thalamic origin for FM- FM neurons is presented.
Peripheral specialization for fine analysis of doppler-shifted echoes in the auditory system of the "CF-FM" bat Pteronotus parnellii.
Pteronotus parnellii uses the second harmonic of the CF component in its orientation sounds for Doppler-shift compensation and its inner ear is mechanically specialized for fine analysis of sounds at about 61-62 kHz, which exhibits prominent transients, slow increase and decrease in amplitude at the onset and cessation of these stimuli.
The pinna are the parts of the outer ear that appear as folds of cartilage. They surround the ear canal and function as sound wave reflectors and attenuators when the waves hit them. The pinna helps…