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https://www.readbyqxmd.com/read/29337239/background-suppression-and-its-relation-to-foreground-processing-of-speech-versus-non-speech-streams
#1
Xiaochen Zhang, Xiaolin Li, Jingjing Chen, Qin Gong
Since sound perception takes place against a background with a certain amount of noise, both speech and non-speech processing involve extraction of target signals and suppression of background noise. Previous works on early processing of speech phonemes largely neglected how background noise is encoded and suppressed. This study aimed to fill in this gap. We adopted an oddball paradigm where speech (vowels) or non-speech stimuli (complex tones) were presented with or without a background of amplitude-modulated noise and analyzed cortical responses related to foreground stimulus processing, including mismatch negativity (MMN), N2b, and P300, as well as neural representations of the background noise, i...
January 11, 2018: Neuroscience
https://www.readbyqxmd.com/read/29319012/using-auditory-steady-state-responses-for-measuring-hearing-protector-occlusion-effect
#2
Olivier Valentin, Frédéric Laville
INTRODUCTION: The currently available methods for measuring the occlusion effect (OE) of hearing protection devices (HPDs) have limitations. Objective microphonic measurements do not assess bone-conducted sounds directly transmitted to the cochlea. Psychophysical measurements at threshold are biased due to the low-frequency masking effects from test participants' physiological noise and the variability of measurements based on subjective responses. An auditory steady-state responses (ASSRs) procedure is used as a technique that might overcome these limitations...
November 2017: Noise & Health
https://www.readbyqxmd.com/read/29236269/the-value-of-assr-threshold-based-bilateral-hearing-aid-fitting-in-children-with-difficult-or-unreliable-behavioral-audiometry
#3
Petros V Vlastarakos, Alexandra Vasileiou, Thomas P Nikolopoulos
We conducted an analysis to assess the relative contribution of auditory brainstem response (ABR) testing and auditory steady-state response (ASSR) testing in providing appropriate hearing aid fitting in hearing-impaired children with difficult or unreliable behavioral audiometry. Of 150 infants and children who had been referred to us for hearing assessment as part of a neonatal hearing screening and cochlear implantation program, we identified 5 who exhibited significant discrepancies between click-ABR and ASSR testing results and difficult or unreliable behavioral audiometry...
December 2017: Ear, Nose, & Throat Journal
https://www.readbyqxmd.com/read/29222679/-objective-audiometry-and-clinical-application
#4
M Cebulla, D Ehrmann-Müller, W Shehata-Dieler
Subjective and objective hearing tests are used for evaluation of hearing impairments. Objective methods include impedance measurement with tympanometry and stapedius reflex measurement, otoacoustic emissions (OAE), and auditory evoked potentials (AEP). Combined with statistical analysis, the introduction of auditory steady state responses (ASSR) has enabled objective hearing tests in newborn hearing screening and automated hearing threshold assessment. The type and degree of hearing loss can be determined using the abovementioned methods...
December 8, 2017: HNO
https://www.readbyqxmd.com/read/29218677/40%C3%A2-hz-auditory-steady-state-response-the-impact-of-handedness-and-gender
#5
Sigita Melynyte, Evaldas Pipinis, Vaida Genyte, Aleksandras Voicikas, Tonia Rihs, Inga Griskova-Bulanova
The 40 Hz auditory steady-state response (ASSR) is a periodic response to a periodic stimulation. Its sources are located in the primary auditory cortex and the asymmetry of the planum temporale has previously been associated with hand preference and gender-related differences; thus subject's handedness and gender could potentially influence ASSRs. Nevertheless, electrophysiological studies of ASSRs are mainly dominated by right-handed participants and the observed findings can only be generalized to the right-handed populations...
December 7, 2017: Brain Topography
https://www.readbyqxmd.com/read/29217404/high-density-eeg-characterization-of-brain-responses-to-auditory-rhythmic-stimuli-during-wakefulness-and-nrem-sleep
#6
Caroline Lustenberger, Yogi A Patel, Sankaraleengam Alagapan, Jessica M Page, Betsy Price, Michael R Boyle, Flavio Frohlich
Auditory rhythmic sensory stimulation modulates brain oscillations by increasing phase-locking to the temporal structure of the stimuli and by increasing the power of specific frequency bands, resulting in Auditory Steady State Responses (ASSR). The ASSR is altered in different diseases of the central nervous system such as schizophrenia. However, in order to use the ASSR as biological markers for disease states, it needs to be understood how different vigilance states and underlying brain activity affect the ASSR...
December 4, 2017: NeuroImage
https://www.readbyqxmd.com/read/29167648/paired-associative-stimulation-of-the-temporal-cortex-effects-on-the-auditory-steady-state-response
#7
Sarah Engel, Robert Daniel Heinrich Markewitz, Berthold Langguth, Martin Schecklmann
Background: Paired associative stimulation (PAS) is the repeated combination of a sensory stimulus with transcranial magnetic stimulation (TMS) in close temporal association. Recently, a study demonstrated that PAS of an auditory stimulus together with TMS of the temporal cortex is capable of changing the amplitude of auditory evoked potentials (AEP). Objective: This study examined the influence of tone duration and habituation in temporal cortex PAS as elicited by 40 and 20 Hz amplitude modulated auditory steady-state responses (aSSR)...
2017: Frontiers in Psychiatry
https://www.readbyqxmd.com/read/29158880/effect-of-mild-cognitive-impairment-and-alzheimer-disease-on-auditory-steady-state-responses
#8
Elaheh Shahmiri, Zahra Jafari, Maryam Noroozian, Azadeh Zendehbad, Hassan Haddadzadeh Niri, Ali Yoonessi
Introduction: Mild Cognitive Impairment (MCI), a disorder of the elderly people, is difficult to diagnose and often progresses to Alzheimer Disease (AD). Temporal region is one of the initial areas, which gets impaired in the early stage of AD. Therefore, auditory cortical evoked potential could be a valuable neuromarker for detecting MCI and AD. Methods: In this study, the thresholds of Auditory Steady-State Response (ASSR) to 40 Hz and 80 Hz were compared between Alzheimer Disease (AD), MCI, and control groups...
July 2017: Basic and Clinical Neuroscience
https://www.readbyqxmd.com/read/29147144/effects-of-spectral-smearing-of-stimuli-on-the-performance-of-auditory-steady-state-response-based-brain-computer-interface
#9
Jong Ho Hwang, Kyoung Won Nam, Dong Pyo Jang, In Young Kim
There have been few reports that investigated the effects of the degree and pattern of a spectral smearing of stimuli due to deteriorated hearing ability on the performance of auditory brain-computer interface (BCI) systems. In this study, we assumed that such spectral smearing of stimuli may affect the performance of an auditory steady-state response (ASSR)-based BCI system and performed subjective experiments using 10 normal-hearing subjects to verify this assumption. We constructed smearing-reflected stimuli using an 8-channel vocoder with moderate and severe hearing loss setups and, using these stimuli, performed subjective concentration tests with three symmetric and six asymmetric smearing patterns while recording electroencephalogram signals...
December 2017: Cognitive Neurodynamics
https://www.readbyqxmd.com/read/29121385/a-controlled-comparison-of-auditory-steady-state-responses-and-pure-tone-audiometry-in-patients-with-hearing-loss
#10
Raman Wadhera, Sharad Hernot, Sat Paul Gulati, Vijay Kalra
We performed a prospective interventional study to evaluate correlations between hearing thresholds determined by pure-tone audiometry (PTA) and auditory steady-state response (ASSR) testing in two types of patients with hearing loss and a control group of persons with normal hearing. The study was conducted on 240 ears-80 ears with conductive hearing loss, 80 ears with sensorineural hearing loss, and 80 normal-hearing ears. We found that mean threshold differences between PTA results and ASSR testing at different frequencies did not exceed 15 dB in any group...
October 2017: Ear, Nose, & Throat Journal
https://www.readbyqxmd.com/read/29092566/linear-combination-of-auditory-steady-state-responses-evoked-by-co-modulated-tones
#11
François Guérit, Jeremy Marozeau, Bastian Epp
Up to medium intensities and in the 80-100-Hz region, the auditory steady-state response (ASSR) to a multi-tone carrier is commonly considered to be a linear sum of the dipoles from each tone specific ASSR generator. Here, this hypothesis was investigated when a unique modulation frequency is used for all carrier components. Listeners were presented with a co-modulated dual-frequency carrier (1 and 4 kHz), from which the modulator starting phase Φi of the 1-kHz component was systematically varied. The results support the hypothesis of a linear superposition of the dipoles originating from different frequency specific ASSR generators...
October 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/29079460/optimized-auditory-transcranial-alternating-current-stimulation-improves-individual-auditory-temporal-resolution
#12
Alina Baltus, Sven Wagner, Carsten Hermann Wolters, Christoph Siegfried Herrmann
BACKGROUND: Temporal resolution of cortical, auditory processing mechanisms is suggested to be linked to peak frequency of neuronal gamma oscillations in auditory cortex areas (individual gamma frequency, IGF): Individuals with higher IGF tend to have better temporal resolution. HYPOTHESIS: Modulating ongoing gamma activity with transcranial alternating current stimulation (tACS) is expected to improve performance in gap detection (GD) tasks (shorter GD thresholds) if the frequency is higher and to decrease GD performance (longer GD thresholds) if the frequency is lower than IGF...
October 17, 2017: Brain Stimulation
https://www.readbyqxmd.com/read/29076484/-features-of-cytokines-profile-in-various-forms-of-systemic-inflammatory-response-syndrome-in-patients-with-acute-calculous-cholecystitis
#13
Dzh N Gadzhiev, N Dzh Gadzhiev, Z B Mamedova
AIM: Comparative evaluation of systemic concentration of some cytokines in various forms of SIR in patients with acute calculous cholecystitis. MATERIAL AND METHODS: The study included 32 patients with acute calculous cholecystitis and SIR. According to ASSR/SCCM criteria SIR 2 was in 11, SIR 3 - in 8, SIR 4 - in 7 patients, 6 patients had sepsis. Serum TNF-α, IL-6, IL-4 and IL-10 were determined prior to surgery, in 3 and 7 days postoperatively by using of ELISA...
2017: Khirurgiia
https://www.readbyqxmd.com/read/29054059/enhancement-of-sludge-reduction-by-ultrasonic-pretreatment-and-packing-carriers-in-the-anaerobic-side-stream-reactor-performance-sludge-characteristics-and-microbial-community-structure
#14
Cheng Cheng, Zhen Zhou, Zhan Qiu, Jiyuan Yang, Wei Wu, Hongjian Pang
Effects of ultrasonic pretreatment and packing carriers on sludge reduction, settleability, dewaterability and microbial community structure in the anaerobic side-stream reactor (ASSR) were investigated with three anaerobic reactors operated in parallel. Ultrasonication from 3.65% in the ASSR to 5.08%, and packing carriers further enhanced the efficiency to 19.2%. Ultrasonic pretreatment of sludge decreased oxidation-reduction potential in ASSR and enhanced the release of intracellular substances. The deterioration of sludge settleability and dewaterability in the ASSR after ultrasonic pretreatment was improved by packing carriers...
October 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/29051085/40hz-auditory-steady-state-response-in-schizophrenia-sensitivity-to-stimulation-type-clicks-versus-flutter-amplitude-modulated-tones
#15
Inga Griskova-Bulanova, Kastytis Dapsys, Sigita Melynyte, Aleksandras Voicikas, Valentinas Maciulis, Sergejus Andruskevicius, Milena Korostenskaja
Auditory steady-state response (ASSR) at 40Hz has been proposed as a potential biomarker for schizophrenia. The ASSR studies in patients have used click stimulation or amplitude-modulated tones. However, the sensitivity of 40Hz ASSRs to different stimulation types in the same group of patients has not been previously evaluated. Two stimulation types for ASSRs were tested in this study: (1) 40Hz clicks and (2) flutter-amplitude modulated tones. The mean phase-locking index, evoked amplitude and event-related spectral perturbation values were compared between schizophrenia patients (n=26) and healthy controls (n=20)...
October 16, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/29036430/delta-vs-gamma-auditory-steady-state-synchrony-in-schizophrenia
#16
Krishna C Puvvada, Ann Summerfelt, Xiaoming Du, Nithin Krishna, Peter Kochunov, Laura M Rowland, Jonathan Z Simon, L Elliot Hong
Background: Delta band (1-4 Hz) neuronal responses support the precision and stability of auditory processing, and a deficit in delta band synchrony may be relevant to auditory domain symptoms in schizophrenia patients. Methods: Delta band synchronization elicited by a 2.5 Hz auditory steady state response (ASSR) paradigm, along with those from theta (5 Hz), alpha (10 Hz), beta (20 Hz), gamma (40 Hz), and high gamma (80 Hz) frequency ASSR, were compared in 128 patients with schizophrenia, 108 healthy controls, and 55 first-degree relatives (FDR) of patients...
June 20, 2017: Schizophrenia Bulletin
https://www.readbyqxmd.com/read/28917446/amplitude-modulation-rate-dependent-topographic-organization-of-the-auditory-steady-state-response-in-human-auditory-cortex
#17
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/28857787/stability-of-auditory-steady-state-responses-over-time
#18
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/28844789/protocadherin-10-alters-%C3%AE-oscillations-amino-acid-levels-and-their-coupling-baclofen-partially-restores-these-oscillatory-deficits
#19
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/28796603/ear-eeg-based-objective-hearing-threshold-estimation-evaluated-on-normal-hearing-subjects
#20
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
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