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Auditory steady state response

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https://www.readbyqxmd.com/read/28917446/amplitude-modulation-rate-dependent-topographic-organization-of-the-auditory-steady-state-response-in-human-auditory-cortex
#1
Nathan Weisz, Chrysoula Lithari
Periodic modulations of an acoustic feature, such as amplitude over a certain frequency range, leads to phase locking of neural responses to the envelope of the modulation. Using electrophysiological methods this neural activity pattern, also called the auditory steady-state response (aSSR), is visible following frequency transformation of the evoked response as a clear spectral peak at the modulation frequency. Despite several studies employing the aSSR that show, for example, strongest responses for ∼40 Hz and an overall right-hemispheric dominance, it has not been investigated so far to what extent within auditory cortex different modulation frequencies elicit aSSRs at a homogenous source or whether the localization of the aSSR is topographically organized in a systematic manner...
September 11, 2017: Hearing Research
https://www.readbyqxmd.com/read/28887876/cell-specific-gain-modulation-by-synaptically-released-zinc-in-cortical-circuits-of-audition
#2
Charles T Anderson, Manoj Kumar, Shanshan Xiong, Thanos Tzounopoulos
In many excitatory synapses, mobile zinc is found within glutamatergic vesicles and is coreleased with glutamate. Ex vivo studies established that synaptically released (synaptic) zinc inhibits excitatory neurotransmission at lower frequencies of synaptic activity but enhances steady state synaptic responses during higher frequencies of activity. However, it remains unknown how synaptic zinc affects neuronal processing in vivo. Here, we imaged the sound-evoked neuronal activity of the primary auditory cortex in awake mice...
September 9, 2017: ELife
https://www.readbyqxmd.com/read/28857787/stability-of-auditory-steady-state-responses-over-time
#3
Maaike Van Eeckhoutte, Robert Luke, Jan Wouters, Tom Francart
OBJECTIVES: Auditory steady state responses (ASSRs) are used in clinical practice for objective hearing assessments. The response is called steady state because it is assumed to be stable over time, and because it is evoked by a stimulus with a certain periodicity, which will lead to discrete frequency components that are stable in amplitude and phase over time. However, the stimuli commonly used to evoke ASSRs are also known to be able to induce loudness adaptation behaviorally. Researchers and clinicians using ASSRs assume that the response remains stable over time...
August 26, 2017: Ear and Hearing
https://www.readbyqxmd.com/read/28855291/the-effect-of-m-current-modulation-on-mammalian-vestibular-responses-to-transient-head-motion
#4
Choongheon Lee, Joseph Christopher Holt, Timothy Arthur Jones
The precise role and mechanisms underlying efferent modulation of peripheral vestibular afferent function are not well understood in mammals. Clarifying the details of efferent action may lead to new strategies for clinical management of debilitating disturbances in vestibular and balance function. Recent evidence in turtle indicates that efferent modulation of M-currents is likely one mechanism for modifying afferent discharge. M-currents depend in part on KCNQ potassium conductances (Kv7) which can be adjusted through efferent activation of M1, M3 and/or M5 muscarinic acetylcholine receptors (mAChRs)...
August 30, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28844789/protocadherin-10-alters-%C3%AE-oscillations-amino-acid-levels-and-their-coupling-baclofen-partially-restores-these-oscillatory-deficits
#5
Russell G Port, Christopher Gajewski, Elizabeth Krizman, Holly C Dow, Shinji Hirano, Edward S Brodkin, Gregory C Carlson, Michael B Robinson, Timothy P L Roberts, Steven J Siegel
Approximately one in 45 children have been diagnosed with Autism Spectrum Disorder (ASD), which is characterized by social/communication impairments. Recent studies have linked a subset of familial ASD to mutations in the Protocadherin 10 (Pcdh10) gene. Additionally, Pcdh10's expression pattern, as well as its known role within protein networks, implicates the gene in ASD. Subsequently, the neurobiology of mice heterozygous for Pcdh10 (Pcdh10(+/-)) has been investigated as a proxy for ASD. Male Pcdh10(+/-) mice have demonstrated sex-specific deficits in social behavior, recapitulating the gender bias observed in ASD...
August 24, 2017: Neurobiology of Disease
https://www.readbyqxmd.com/read/28802870/audio-visual-synchrony-and-spatial-attention-enhance-processing-of-dynamic-visual-stimulation-independently-and-in-parallel-a-frequency-tagging-study
#6
Amra Covic, Christian Keitel, Emanuele Porcu, Erich Schröger, Matthias M Müller
The neural processing of a visual stimulus can be facilitated by attending to its position or by a co-occurring auditory tone. Using frequency-tagging, we investigated whether facilitation by spatial attention and audio-visual synchrony rely on similar neural processes. Participants attended to one of two flickering Gabor patches (14.17 and 17 Hz) located in opposite lower visual fields. Gabor patches further "pulsed" (i.e. showed smooth spatial frequency variations) at distinct rates (3.14 and 3.63 Hz). Frequency-modulating an auditory stimulus at the pulse-rate of one of the visual stimuli established audio-visual synchrony...
August 9, 2017: NeuroImage
https://www.readbyqxmd.com/read/28800744/physiological-artifacts-in-scalp-eeg-and-ear-eeg
#7
Simon L Kappel, David Looney, Danilo P Mandic, Preben Kidmose
BACKGROUND: A problem inherent to recording EEG is the interference arising from noise and artifacts. While in a laboratory environment, artifacts and interference can, to a large extent, be avoided or controlled, in real-life scenarios this is a challenge. Ear-EEG is a concept where EEG is acquired from electrodes in the ear. METHODS: We present a characterization of physiological artifacts generated in a controlled environment for nine subjects. The influence of the artifacts was quantified in terms of the signal-to-noise ratio (SNR) deterioration of the auditory steady-state response...
August 11, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28796603/ear-eeg-based-objective-hearing-threshold-estimation-evaluated-on-normal-hearing-subjects
#8
Christian Bech Christensen, James Michael Harte, Thomas Lunner, Preben Kidmose
OBJECTIVE: Hearing threshold levels have been estimated successfully in the clinic using the objective EEG-based technique of auditory steady state response (ASSR). The recent method of ear-EEG could enable ASSR hearing tests to be made in everyday life, rather than in a specialized clinic, enabling cheaper and easier monitoring of audiometric thresholds over time. The objective of the current study was to evaluate the feasibility of ear-EEG in audiometric characterization of auditory sensitivity thresholds...
August 9, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28756648/objective-assessment-of-hearing-during-second-stage-of-tympanoplasty-surgical-technique-and-measurement-methodology-presented-in-ten-patients
#9
Kazimierz Niemczyk, Krzysztof Morawski, Rafael Delgado, Antoni Bruzgielewicz, Magdalena Lachowska
In this paper, a complete integrated method of intraoperative monitoring of hearing (IOMH) during ossiculoplasty performed via posterior tympanotomy is presented. The method integrates auditory steady state responses (ASSR) with Laser-Doppler Vibrometry (LDV) and allows intraoperative optimization of ossicular prosthesis positioning and coupling. Both ASSR and LDV are acquired simultaneously. The results of the integrated measurements are analyzed and evaluated automatically on-line which makes this strategy unaffected by individual differences in interpretations of collected recordings...
July 30, 2017: Clinical Otolaryngology
https://www.readbyqxmd.com/read/28708794/position-of-the-internal-aperture-of-vestibular-aqueduct-in-patients-with-enlarged-vestibular-aqueduct
#10
Huiying Lyu, Juan Hong, Dongming Yin, Keguang Chen, Jieying Li, Lin Yang, Tianyu Zhang, Peidong Dai
OBJECTIVE: To investigate the position of the internal aperture of vestibular aqueduct and its relationship to hearing level in patients with enlarged vestibular aqueduct (EVA). METHODS: The size of the common crus and the position of the internal aperture of vestibular aqueduct were compared among control subjects, EVA patients with and without other inner ear malformations. Auditory steady-state response thresholds were compared between EVA patients with different positions of internal apertures...
September 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28692981/a-new-method-to-test-the-efficiency-of-cochlear-implant-artifacts-removal-from-auditory-evoked-potentials
#11
Virginie Attina, Faten Mina, Pierre Stahl, Yvan Duroc, Evelyne Veuillet, Eric Truy, Hung Thai-Van
Auditory Evoked Potentials (AEPs) are of great interest to objectively evaluate the audition in cochlear implant (CI) recipients. However, these measures are impeded by CI stimulation electrical artifacts present in the EEG. In a first part, this study investigates the use of a hybrid model approximating CI patient data. This model gives access to both uncontaminated and denoised data, thus allowing for the evaluation of CI artifact removal methods. Here the efficiency of Independent Component Analysis (ICA) is evaluated in the context of Auditory Steady State Responses (ASSRs)...
July 6, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28688560/speech-evoked-auditory-brainstem-responses-in-children-with-hearing-loss
#12
Amineh Koravand, Rida Al Osman, Véronique Rivest, Catherine Poulin
OBJECTIVE: The main objective of the present study was to investigate subcortical auditory processing in children with sensorineural hearing loss. METHODS: Auditory Brainstem Responses (ABRs) were recorded using click and speech/da/stimuli. Twenty-five children, aged 6-14 years old, participated in the study: 13 with normal hearing acuity and 12 with sensorineural hearing loss. RESULTS: No significant differences were observed for the click-evoked ABRs between normal hearing and hearing-impaired groups...
August 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/28686908/a-longitudinal-study-investigating-neural-processing-of-speech-envelope-modulation-rates-in-children-with-a-family-risk-for-dyslexia
#13
Astrid De Vos, Sophie Vanvooren, Jolijn Vanderauwera, Pol Ghesquière, Jan Wouters
Recent evidence suggests that a fundamental deficit in the synchronization of neural oscillations to temporal information in speech may underlie phonological processing problems in dyslexia. Since previous studies were performed cross-sectionally in school-aged children or adults, developmental aspects of neural auditory processing in relation to reading acquisition and dyslexia remain to be investigated. The present longitudinal study followed 68 children during development from pre-reader (5 years old) to beginning reader (7 years old) and more advanced reader (9 years old)...
August 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28680486/longitudinal-comparison-of-auditory-steady-state-evoked-potentials-in-preterm-and-term-infants-the-maturation-process
#14
Ana Constantino Sousa, Dayane Domeneghini Didoné, Pricila Sleifer
Introduction  Preterm neonates are at risk of changes in their auditory system development, which explains the need for auditory monitoring of this population. The Auditory Steady-State Response (ASSR) is an objective method that allows obtaining the electrophysiological thresholds with greater applicability in neonatal and pediatric population. Objective  The purpose of this study is to compare the ASSR thresholds in preterm and term infants evaluated during two stages. Method  The study included 63 normal hearing neonates: 33 preterm and 30 term...
July 2017: International Archives of Otorhinolaryngology
https://www.readbyqxmd.com/read/28659780/estimation-of-human-workload-from-the-auditory-steady-state-response-recorded-via-a-wearable-electroencephalography-system-during-walking
#15
Yusuke Yokota, Shingo Tanaka, Akihiro Miyamoto, Yasushi Naruse
Workload in the human brain can be a useful marker of internal brain state. However, due to technical limitations, previous workload studies have been unable to record brain activity via conventional electroencephalography (EEG) and magnetoencephalography (MEG) devices in mobile participants. In this study, we used a wearable EEG system to estimate workload while participants walked in a naturalistic environment. Specifically, we used the auditory steady-state response (ASSR) which is an oscillatory brain activity evoked by repetitive auditory stimuli, as an estimation index of workload...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28635497/desynchronisation-of-auditory-steady-state-responses-related-to-changes-in-interaural-phase-differences-an-objective-measure-of-binaural-hearing
#16
Charlotte Vercammen, Astrid van Wieringen, Jan Wouters, Tom Francart
OBJECTIVE: Binaural processing can be measured objectively as a desynchronisation of phase-locked neural activity to changes in interaural phase differences (IPDs). This was reported in a magnetoencephalography study for 40 Hz amplitude modulated tones. The goal of this study was to measure this desynchronisation using electroencephalography and explore the outcomes for different modulation frequencies. DESIGN: Auditory steady-state responses (ASSRs) were recorded to pure tones, amplitude modulated at 20, 40 or 80 Hz...
February 14, 2017: International Journal of Audiology
https://www.readbyqxmd.com/read/28628154/-morphological-changes-on-cochlear-hair-cells-of-rats-in-simulated-weightlessness-and-inboard-noise
#17
(no author information available yet)
OBJECTIVE: To observe the morphological changes on cochlear hair cells of rats in simulated weightlessness and inboard noise and to investigate the different changes in three turns of hair cells. METHODS: Thirty-two healthy SD rats, all males, were randomly divided into four groups: control group, weightlessness group, noise group and weightlessness+noise groups (n=8). Then rats were exposed to -30° head down tilt as simulated weightlessness and inboard noise including steady-state noise which was (72±2) dB SPL and impulse noise up to 160 dB SPL in spaceship environment...
June 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28599607/the-accuracy-of-objective-threshold-determination-at-low-frequencies-comparison-of-different-auditory-brainstem-response-abr-and-auditory-steady-state-response-assr-methods
#18
Jacqueline Frank, Izet Baljić, Sebastian Hoth, Dirk Eßer, Orlando Guntinas-Lichius
OBJECTIVE: The hearing threshold at 500 Hz was estimated using five methods which are suitable for the low frequency range: Low-Chirp BERA (LCBERA), Notched-noise BERA (NNBERA), Narrow band CE-Chirp BERA (NBCBERA) and Narrow band CE-Chirp ASSR (NBCASSR) (40/90 Hz). The slope of the discrimination function of each method was used for determination of the most efficient method. The threshold values were compared and the corresponding odds ratios (OR) were calculated. DESIGN: All methods were applied to each subject...
May 2017: International Journal of Audiology
https://www.readbyqxmd.com/read/28521049/22q11-2-deletion-syndrome-is-associated-with-impaired-auditory-steady-state-gamma-response
#19
Kit Melissa Larsen, Giovanni Pellegrino, Michelle Rosgaard Birknow, Trine Nørgaard Kjær, William Frans Christiaan Baaré, Michael Didriksen, Line Olsen, Thomas Werge, Morten Mørup, Hartwig Roman Siebner
Background: The 22q11.2 deletion syndrome confers a markedly increased risk for schizophrenia. 22q11.2 deletion carriers without manifest psychotic disorder offer the possibility to identify functional abnormalities that precede clinical onset. Since schizophrenia is associated with a reduced cortical gamma response to auditory stimulation at 40 Hz, we hypothesized that the 40 Hz auditory steady-state response (ASSR) may be attenuated in nonpsychotic individuals with a 22q11.2 deletion...
May 17, 2017: Schizophrenia Bulletin
https://www.readbyqxmd.com/read/28446582/auditory-fear-conditioning-modifies-steady-state-evoked-potentials-in-the-rat-inferior-colliculus
#20
André Luiz Vieira Lockmann, Flávio Afonso Gonçalves Mourão, Marcio Flávio Dutra Moraes
The rat inferior colliculus (IC) is a major midbrain relay for ascending inputs from the auditory brain stem and has been suggested to play a key role in the processing of aversive sounds. Previous studies have demonstrated that auditory fear conditioning (AFC) potentiates transient responses to brief tones in the IC, but it remains unexplored whether AFC modifies responses to sustained periodic acoustic stimulation-a type of response called the steady-state evoked potential (SSEP). Here we used an amplitude-modulated tone-a 10-kHz tone with a sinusoidal amplitude modulation of 53...
August 1, 2017: Journal of Neurophysiology
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