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inferior colliculus

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https://www.readbyqxmd.com/read/29790835/tuning-for-the-rate-and-duration-of-frequency-modulated-fm-sweeps-in-the-mammalian-inferior-colliculus
#1
James Alexander Morrison, Roberto Valdizón-Rodríguez, Daniel Goldreich, Paul A Faure
Responses of auditory duration-tuned neurons (DTNs) are selective for stimulus duration. We used single-unit extracellular recording to investigate how the inferior colliculus (IC) encodes frequency modulated (FM) sweeps in the big brown bat. It was unclear whether the responses of so-called "FM DTNs" encode signal duration, like classic pure tone DTNs, or the FM sweep rate. Most FM cells had spiking responses selective for downward FM sweeps. We presented cells with linear FM sweeps whose center frequency (CEF) was set to the best excitatory frequency and whose bandwidth (BW) maximized the spike count...
May 23, 2018: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29773471/increased-spontaneous-firing-rates-in-auditory-midbrain-following-noise-exposure-are-specifically-abolished-by-a-kv3-channel-modulator
#2
Lucy A Anderson, Lara L Hesse, Nadia Pilati, Warren M H Bakay, Giuseppe Alvaro, Charles H Large, David McAlpine, Roland Schaette, Jennifer F Linden
Noise exposure has been shown to produce long-lasting increases in spontaneous activity in central auditory structures in animal models, and similar pathologies are thought to contribute to clinical phenomena such as hyperacusis or tinnitus in humans. Here we demonstrate that multi-unit spontaneous neuronal activity in the inferior colliculus (IC) of mice is significantly elevated four weeks following noise exposure at recording sites with frequency tuning within or near the noise exposure band, and this selective central auditory pathology can be normalised through administration of a novel compound that modulates activity of Kv3 voltage-gated ion channels...
April 30, 2018: Hearing Research
https://www.readbyqxmd.com/read/29763575/social-isolation-reduces-serotonergic-fiber-density-in-the-inferior-colliculus-of-female-but-not-male-mice
#3
Sarah M Keesom, Mitchell D Morningstar, Rebecca Sandlain, Bradley M Wise, Laura M Hurley
Early-life experiences, including maternal deprivation and social isolation during adolescence, have a profound influence on a range of adult social behaviors. Post-weaning social isolation in rodents influences behavior in part through the alteration of neuromodulatory systems, including the serotonergic system. Of significance to social behavior, the serotonergic system richly innervates brain areas involved in vocal communication, including the auditory system. However, the influence of isolation on serotonergic input to the auditory system remains underexplored...
May 12, 2018: Brain Research
https://www.readbyqxmd.com/read/29744729/supra-threshold-hearing-and-fluctuation-profiles-implications-for-sensorineural-and-hidden-hearing-loss
#4
REVIEW
Laurel H Carney
An important topic in contemporary auditory science is supra-threshold hearing. Difficulty hearing at conversational speech levels in background noise has long been recognized as a problem of sensorineural hearing loss, including that associated with aging (presbyacusis). Such difficulty in listeners with normal thresholds has received more attention recently, especially associated with descriptions of synaptopathy, the loss of auditory nerve (AN) fibers as a result of noise exposure or aging. Synaptopathy has been reported to cause a disproportionate loss of low- and medium-spontaneous rate (L/MSR) AN fibers...
May 9, 2018: Journal of the Association for Research in Otolaryngology: JARO
https://www.readbyqxmd.com/read/29740286/optogenetic-control-of-neural-circuits-in-the-mongolian-gerbil
#5
Stefan Keplinger, Barbara Beiderbeck, Stylianos Michalakis, Martin Biel, Benedikt Grothe, Lars Kunz
The Mongolian gerbil ( Meriones unguiculatus ) is widely used as a model organism for the human auditory system. Its hearing range is very similar to ours and it uses the same mechanisms for sound localization. The auditory circuits underlying these functions have been characterized. However, important mechanistic details are still under debate. To elucidate these issues, precise and reversible optogenetic manipulation of neuronal activity in this complex circuitry is required. However, genetic and genomic resources for the Mongolian gerbil are poorly developed...
2018: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/29716239/reduction-of-sound-evoked-midbrain-responses-observed-by-functional-magnetic-resonance-imaging-following-acute-acoustic-noise-exposure
#6
Bin Yang, Eddie Wong, Wai Hong Ho, Condon Lau, Ying Shing Chan, Ed X Wu
Short duration and high intensity acoustic exposures can lead to temporary hearing loss and auditory nerve degeneration. This study investigates central auditory system function following such acute exposures after hearing loss recedes. Adult rats were exposed to 100 dB sound pressure level noise for 15 min. Auditory brainstem responses (ABRs) were recorded with click sounds to check hearing thresholds. Functional magnetic resonance imaging (fMRI) was performed with tonal stimulation at 12 and 20 kHz to investigate central auditory changes...
April 2018: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/29691577/-ascending-input-from-dorsal-nuclei-of-lateral-lemniscus-mediates-the-plasticity-of-inferior-colliculus-neurons-in-mice
#7
Dan-Dan Yang, Wei-Wei Zheng, Sha-Sha Zhao, Feng Luo, Xin Wang
The auditory system has the ability to adjust its structure and function as the environment changes, which is called auditory plasticity. In the auditory system, inferior colliculus (IC) is an important relay station, which accepts the ascending inputs from dorsal nuclei of lateral lemniscus (DNLL). The present study was aimed to investigate the role of the DNLL in the formation of the plasticity of IC neurons. Here, we used extracellular single unit recording and electrical stimulation to investigate the plasticity of IC neurons in Kunming mice...
April 25, 2018: Sheng Li Xue Bao: [Acta Physiologica Sinica]
https://www.readbyqxmd.com/read/29680272/brain-sites-mediating-cyclosomatostatin-induced-catalepsy-in-wistar-rats-a-specific-role-for-the-nigrostriatal-system-and-locus-coeruleus
#8
Ilya D Ionov, Irina I Pushinskaya, Larissa A Roslavtseva, Nicholas N Severtsev
A decrease in somatostatin activity is observed in the Parkinsonian brain. In recent experiments on rats, we simulated this abnormality by intracerebroventricular injections of a somatostatin antagonist, cyclosomatostatin. The treated animals displayed catalepsy, a state that resembles the extrapyramidal signs of Parkinson's disease. The neuroanatomical substrates mediating the catalepsy-inducing effect of cyclosomatostatin are unknown. To clarify this issue, we assessed here the action of cyclosomatostatin injected into the substantia nigra pars compacta (SNc), dorsal striatum (DS), locus coeruleus (LC), pedunculopontine tegmental nucleus (PPTg), and inferior colliculus (IC)...
April 19, 2018: Brain Research
https://www.readbyqxmd.com/read/29658111/architectonic-characteristics-of-the-visual-thalamus-and-superior-colliculus-in-titi-monkeys
#9
Mary Kl Baldwin, Leah Krubitzer
Titi monkeys are arboreal, diurnal New World monkeys whose ancestors were the first surviving branch of the New World radiation. In the current study, we use cytoarchtectonic and immunohistochemical characteristics to compare subcortical structures associated with visual processing with those of other well-studied primates. Our goal was to appreciate features that are similar across all New World monkeys, and primates in general, versus those features that are unique to titi monkeys and other primate taxa. We examined tissue stained for Nissl substance, cytochrome oxidase (CO), acetylcholinesterase (AChE), calbindin (Cb), parvalbumin (Pv), and vesicular glutamate transporter 2 (VGLUT2) to characterize the superior colliculus, lateral geniculate nucleus, and visual pulvinar...
April 15, 2018: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/29652586/a-computational-account-of-the-role-of-cochlear-nucleus-and-inferior-colliculus-in-stabilizing-auditory-nerve-firing-for-auditory-category-learning
#10
Irina Higgins, Simon Stringer, Jan Schnupp
It is well known that auditory nerve (AN) fibers overcome bandwidth limitations through the volley principle, a form of multiplexing. What is less well known is that the volley principle introduces a degree of unpredictability into AN neural firing patterns that may be affecting even simple stimulus categorization learning. We use a physiologically grounded, unsupervised spiking neural network model of the auditory brain with spike time dependent plasticity learning to demonstrate that plastic auditory cortex is unable to learn even simple auditory object categories when exposed to the raw AN firing input without subcortical preprocessing...
April 13, 2018: Neural Computation
https://www.readbyqxmd.com/read/29623480/the-segmentation-of-the-posterior-cerebral-artery-a-microsurgical-anatomic-study
#11
Aysun Uz
There are still different descriptions of the segmentation of the posterior cerebral artery, although there is a radiological and anatomical consensus on the segmentation of the anterior and the middle cerebral artery. This study aims to define the most appropriate localization for origin and end points of the segments through reviewing the segmentation of the posterior cerebral artery. The segments and the cortical branches originating from those segments of the 40 posterior cerebral arteries of 20 cadaver brains were examined under operating microscope...
April 6, 2018: Neurosurgical Review
https://www.readbyqxmd.com/read/29604459/subcortical-sources-dominate-the-neuroelectric-auditory-frequency-following-response-to-speech
#12
Gavin M Bidelman
Frequency-following responses (FFRs) are neurophonic potentials that provide a window into the encoding of complex sounds (e.g., speech/music), auditory disorders, and neuroplasticity. While the neural origins of the FFR remain debated, renewed controversy has reemerged after demonstration that FFRs recorded via magnetoencephalography (MEG) are dominated by cortical rather than brainstem structures as previously assumed. Here, we recorded high-density (64 ch) FFRs via EEG and applied state-of-the art source imaging techniques to multichannel data (discrete dipole modeling, distributed imaging, independent component analysis, computational simulations)...
March 28, 2018: NeuroImage
https://www.readbyqxmd.com/read/29603825/processing-of-interaural-phase-differences-in-components-of-harmonic-and-mistuned-complexes-in-the-inferior-colliculus-of-the-mongolian-gerbil
#13
Lena Eipert, Astrid Klinge-Strahl, Georg M Klump
Harmonicity as well as spatial location provide eminent cues for the perceptual grouping of sounds. In general, harmonicity is a strong grouping cue. In contrast, spatial cues such as interaural phase or time difference provide for strong grouping of stimulus sequences but weak grouping for simultaneously presented sounds. By studying the neuronal basis underlying the interaction of these cues in processing simultaneous sounds using van Rossum spike train distance measures, we aim at explaining the interaction observed in psychophysical experiments...
March 30, 2018: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29582488/binaural-responses-in-the-auditory-midbrain-of-chicken-gallus-gallus
#14
Roberta Aralla, Go Ashida, Christine Köppl
The auditory midbrain is the location in which neurons represent binaural acoustic information necessary for sound localization. The external nucleus of the midbrain inferior colliculus (IC) of the barn owl is a classic example of an auditory space map, but it is unknown to what extent the principles underlying its formation generalize to other, less specialized animals. We characterized the spiking responses of 139 auditory neurons in the IC of the chicken (Gallus gallus) in vivo, focusing on their sensitivities to the binaural localization cues of interaural time (ITD) and level (ILD) differences...
March 26, 2018: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29573880/responses-of-neurons-in-the-feline-inferior-colliculus-to-modulated-electrical-stimuli-applied-on-and-within-the-ventral-cochlear-nucleus-implications-for-an-advanced-auditory-brainstem-implant
#15
Douglas McCreery, Kamal Yadev, Martin Han
Auditory brainstem implants (ABIs) can restore useful hearing to persons with deafness who cannot benefit from cochlear implants. However, the quality of hearing restored by ABIs rarely is comparable to that provided by cochlear implants in persons for whom those are appropriate. In an animal model, we evaluated elements of a prototype of an ABI in which the functions of macroelectrodes on the surface of the dorsal cochlear nucleus would be integrated with the function of multiple penetrating microelectrodes implanted into the ventral cochlear nucleus...
March 9, 2018: Hearing Research
https://www.readbyqxmd.com/read/29571712/frequency-specific-attentional-modulation-in-human-primary-auditory-cortex-and-midbrain
#16
Lars Riecke, Judith C Peters, Giancarlo Valente, Benedikt A Poser, Valentin G Kemper, Elia Formisano, Bettina Sorger
Paying selective attention to an audio frequency selectively enhances activity within primary auditory cortex (PAC) at the tonotopic site (frequency channel) representing that frequency. Animal PAC neurons achieve this 'frequency-specific attentional spotlight' by adapting their frequency tuning, yet comparable evidence in humans is scarce. Moreover, whether the spotlight operates in human midbrain is unknown. To address these issues, we studied the spectral tuning of frequency channels in human PAC and inferior colliculus (IC), using 7-T functional magnetic resonance imaging (FMRI) and frequency mapping, while participants focused on different frequency-specific sounds...
March 20, 2018: NeuroImage
https://www.readbyqxmd.com/read/29550392/paradoxical-kinesia-induced-by-appetitive-50-khz-ultrasonic-vocalizations-in-rats-depends-on-glutamatergic-mechanisms-in-the-inferior-colliculus
#17
Luan Castro Tonelli, Markus Wöhr, Rainer Schwarting, Liana Melo-Thomas
Paradoxical kinesia is a sudden transient ability of akinetic patients to perform motor tasks they are otherwise unable to perform. This phenomenon is known to depend on the patient's emotional state and external stimuli. Paradoxical kinesia can be induced by appetitive 50-kHz ultrasonic vocalizations (USV) in rats displaying catalepsy following systemic haloperidol. We investigated the role of the inferior colliculus (IC) in paradoxical kinesia induced by 50-kHz USV, since the IC modulates haloperidol-induced catalepsy...
March 14, 2018: Neuropharmacology
https://www.readbyqxmd.com/read/29520220/astrocyte-hypertrophy-and-microglia-activation-in-the-rat-auditory-midbrain-is-induced-by-electrical-intracochlear-stimulation
#18
Nicole Rosskothen-Kuhl, Heika Hildebrandt, Ralf Birkenhäger, Robert-Benjamin Illing
Neuron-glia interactions contribute to tissue homeostasis and functional plasticity in the mammalian brain, but it remains unclear how this is achieved. The potential of central auditory brain tissue for stimulation-dependent cellular remodeling was studied in hearing-experienced and neonatally deafened rats. At adulthood, both groups received an intracochlear electrode into the left cochlea and were continuously stimulated for 1 or 7 days after waking up from anesthesia. Normal hearing and deafness were assessed by auditory brainstem responses (ABRs)...
2018: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/29488007/tinnitus-and-temporary-hearing-loss-result-in-differential-noise-induced-spatial-reorganization-of-brain-activity
#19
Antonela Muca, Emily Standafer, Aaron K Apawu, Farhan Ahmad, Farhad Ghoddoussi, Mirabela Hali, James Warila, Bruce A Berkowitz, Avril Genene Holt
Loud noise frequently results in hyperacusis or hearing loss (i.e., increased or decreased sensitivity to sound). These conditions are often accompanied by tinnitus (ringing in the ears) and changes in spontaneous neuronal activity (SNA). The ability to differentiate the contributions of hyperacusis and hearing loss to neural correlates of tinnitus has yet to be achieved. Towards this purpose, we used a combination of behavior, electrophysiology, and imaging tools to investigate two models of noise-induced tinnitus (either with temporary hearing loss or with permanent hearing loss)...
February 27, 2018: Brain Structure & Function
https://www.readbyqxmd.com/read/29483283/neuronal-organization-in-the-inferior-colliculus-revisited-with-cell-type-dependent-monosynaptic-tracing
#20
Chenggang Chen, Mingxiu Cheng, Tetsufumi Ito, Sen Song
The inferior colliculus (IC) is a critical integration center in the auditory pathway. However, because the inputs to the IC have typically been studied by the use of conventional anterograde and retrograde tracers, the neuronal organization and cell-type-specific connections in the IC are poorly understood. Here, we used monosynaptic rabies tracing and in situ hybridization combined with excitatory and inhibitory Cre transgenic mouse lines of both sexes to characterize the brainwide and cell-type-specific inputs to specific neuron types within the lemniscal IC core and nonlemniscal IC shell...
March 28, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
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