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https://www.readbyqxmd.com/read/29746895/low-and-high-gamma-auditory-steady-states-in-response-to-440-hz-carrier-chirp-modulated-tones-show-no-signs-of-attentional-modulation
#1
Evaldas Pipinis, Aleksandras Voicikas, Inga Griskova-Bulanova
Auditory steady-state responses (ASSRs) are increasingly used as a neurodiagnostical tool and in neurotechnological applications where it is important to test responses at different frequencies. We aimed to evaluate EEG responses to a low-frequency carrier (440 Hz) tone modulated with 500 ms chirps at 1-120 Hz and to test the ability of stimulation to highlight the low and high gamma band activity. Increasing and decreasing modulation rates were applied. Subjective pleasantness of chirps and attentional effects on ASSRs to chirps were assessed...
May 7, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/29745515/-progress-of-generation-mechanisms-of-auditory-steady-state-response
#2
REVIEW
Xiaodan Tan, Qiuyang Fu, Tao Wang
The scalp-recorded auditory steady-state response (ASSR) is a periodically evoked potential in response to the stimulation with the acoustical property in the same period. The ASSR can be readily induced in comparison with transient responses for specific conditions. The clinical utility of ASSR may be unjustified for the ambiguity of the genesis. With the advance of relevant research, it is considered that the main generation hypotheses of the ASSR are conceived to be pertinent with the linear superposition or neural entrainment mechanism...
June 1, 2017: Sheng Wu Yi Xue Gong Cheng Xue za Zhi, Journal of Biomedical Engineering, Shengwu Yixue Gongchengxue Zazhi
https://www.readbyqxmd.com/read/29719356/defects-of-gamma-oscillations-in-auditory-steady-state-evoked-potential-of-schizophrenia
#3
Chenhui Sun, Ping Zhou, Changming Wang, Yu Fan, Qing Tian, Fang Dong, Fuchun Zhou, Chuanyue Wang
Background: Patients with schizophrenia have many cognitive deficits. Gamma oscillations exist in the human brain and are closely related to neurocognition. Auditory Steady-State Responses (ASSRs) is an electroneurophysiological index that could reflect gamma oscillations. It was found that the energy evoked by 40 Hz ASSRs in schizophrenic patients was significantly lower than that in healthy subjects. However, the correlation between ASSRs phase index and clinical symptoms and neurocognitive deficits has yet to be systematically studied...
February 25, 2018: Shanghai Archives of Psychiatry
https://www.readbyqxmd.com/read/29705712/abnormal-auditory-evoked-gamma-band-oscillations-in-first-episode-schizophrenia-during-both-eye-open-and-eye-close-states
#4
Junjie Wang, Yingying Tang, Adrian Curtin, Raymond C K Chan, Ya Wang, Hui Li, Tianhong Zhang, Zhenying Qian, Qian Guo, Yu Li, Xu Liu, Xiaochen Tang, Jijun Wang
Abnormal auditory steady state response (ASSR) is a typical finding among schizophrenia patients, which is thought to directly reflect deficient gamma band oscillations in the brain. However, whether these ASSR alterations are state dependent, e.g. during eye-open or eye-closed conditions, has not yet been carefully elucidated in schizophrenia. Our study aimed to explore whether the abnormality of ASSR in patients with first-episode schizophrenia (FEP) is altered under eye-open (EO) and eye-closed (EC) states...
April 26, 2018: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/29672320/correlation-between-preoperative-auditory-steady-state-response-and-postoperative-electrically-evoked-auditory-brainstem-response-and-t-level-in-cochlear-implantation-for-child-patients-with-inner-ear-malformations
#5
Xiao-Feng Qiao, Xin Li, Dong Wang, Tong-Li Li
OBJECTIVE: This study aims to investigate the correlation between thresholds of preoperative multiple auditory steady-state response (ASSR) and electrically evoked auditory brainstem response (EABR) and the behavioral threshold. METHODS: A total of 72 patients were elected to receive a multichannel cochlear implant. According to the residual hearing determined in a preoperative test using high-, moderate-, and low-frequency ASSR, these patients were divided into the following 2 groups: residual hearing and hearing loss...
April 19, 2018: ORL; Journal for Oto-rhino-laryngology and its related Specialties
https://www.readbyqxmd.com/read/29655974/tacs-mediated-modulation-of-the-auditory-steady-state-response-as-seen-with-meg
#6
Petteri Hyvärinen, Dawoon Choi, Gianpaolo Demarchi, Antti A Aarnisalo, Nathan Weisz
BACKGROUND: Previous studies have shown that transcranial electrical stimulation can be successfully applied during simultaneous MEG measurements. In particular, using beamforming they have established that changes of stimulus induced as well as evoked activity can be inspected during transcranial alternating current stimulation (tACS). OBJECTIVE/HYPOTHESIS: We studied tACS-mediated changes of the auditory steady-state response (ASSR), hypothesizing that-due to the putatively inhibitory role of alpha oscillations-these evoked responses would be diminished...
March 28, 2018: Hearing Research
https://www.readbyqxmd.com/read/29650320/assessment-of-auditory-threshold-using-multiple-magnitude-squared-coherence-and-amplitude-modulated-tones-monaural-stimulation-around-40-hz
#7
Glaucia de Morais Silva, Felipe Antunes, Catherine Salvador Henrique, Leonardo Bonato Felix
BACKGROUND AND OBJECTIVE: The use of objective detection techniques applied to the auditory steady-state responses (ASSRs) for the assessment of auditory thresholds has been investigated over the years. The idea consists in setting up the audiometric profile without subjective inference from patients and evaluators. The challenge encountered is to reduce the detection time of auditory thresholds reaching high correlation coefficients between the objective and the conventional thresholds, as well as reducing difference between thresholds...
June 2018: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/29624540/evaluation-of-speed-and-accuracy-of-next-generation-auditory-steady-state-response-and-auditory-brainstem-response-audiometry-in-children-with-normal-hearing-and-hearing-loss
#8
Yvonne S Sininger, Lisa L Hunter, Deborah Hayes, Patricia A Roush, Kristin M Uhler
OBJECTIVES: The first objective of this study was to compare the predicted audiometric thresholds obtained by auditory steady state response (ASSR) and auditory brainstem response (ABR) in infants and toddlers when both techniques use optimal stimuli and detection algorithms. This information will aid in determining the basis for large discrepancies in ABR and ASSR measures found in past studies. The hypothesis was that advancements in ASSR response detection would improve (lower) thresholds and decrease discrepancies between the thresholds produced by the two techniques...
April 5, 2018: Ear and Hearing
https://www.readbyqxmd.com/read/29559420/global-field-synchronization-of-40-hz-auditory-steady-state-response-does-it-change-with-attentional-demands
#9
Inga Griskova-Bulanova, Evaldas Pipinis, Aleksandras Voicikas, Thomas Koenig
Auditory steady-state responses (ASSRs) are increasingly used in research of neuropsychiatric disorders and for brain-computer interface applications. However, results on attentional modulation of ASSRs are inconclusive. The evaluation of large-scale effects of task-related modulation on ASSRs might give better estimation of the induced changes. The aim of the study was to test global field synchronization - a reference-independent evaluation of the amount of phase-locking among all active regions at a given frequency - during tasks differing in attentional demands to 40 Hz auditory stimulation...
March 17, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/29550667/biological-minimization-of-excess-sludge-in-a-membrane-bioreactor-effect-of-plant-configuration-on-sludge-production-nutrient-removal-efficiency-and-membrane-fouling-tendency
#10
Taissa Silva de Oliveira, Santo Fabio Corsino, Daniele Di Trapani, Michele Torregrossa, Gaspare Viviani
Excess sludge minimization was studied in a MBR with pre-denitrification scheme. Sludge minimization, nitrogen removal performance and membrane fouling tendency were investigated in two configurations, characterized by a different position of the sludge retention reactor (SRR). In particular, the SRR was placed: i) in the return activated sludge line (Anaerobic Side-Stream Reactor - ASSR configuration) and ii) in the mainstream between the anoxic and aerobic reactor (Anaerobic Main-Stream Reactor - AMSR configuration)...
March 9, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29504434/threshold-monitoring-of-intraoperative-auditory-steady-state-responses-for-ossiculoplasty-surgery
#11
Qingsong Liu, Guodong Feng, Yingying Shang, Cheng Chi, Yufei Qiao, Zhiqiang Gao
OBJECTIVE: The objective of this study is to establish a reliable intraoperative auditory threshold monitoring system for ossiculoplasty surgery. DESIGN: The chirp signal of self-designed sound field earphone (SFE) was calibrated physically and psychophysically. The interaural attenuation of the SFE was tested in patients with unilateral complete deafness and contralateral normal hearing (10 patients). Self-designed SFEs were used to measure the chirp-evoked auditory steady-state responses (Chirp-ASSR) threshold of patients (14 cases and 15 ears) with conductive hearing loss after anesthesia but before surgery...
March 5, 2018: Acta Oto-laryngologica
https://www.readbyqxmd.com/read/29489895/gamma-band-auditory-steady-state-response-after-frontal-tdcs-a-double-blind-randomized-crossover-study
#12
Yoshiaki Miyagishi, Takashi Ikeda, Tetsuya Takahashi, Kiwamu Kudo, Hirofumi Morise, Yoshio Minabe, Mitsuru Kikuchi
The effects of transcranial direct current stimulation (tDCS) likely depend on cortical N-methyl-D-aspartic acid (NMDA) neurotransmission; however, no previous studies have reported tDCS-mediated modulation of cortical NMDA neurotransmission in humans. The gamma-band auditory steady-state response (ASSR) to a 40 Hz stimulation likely reflects the integrity of cortical NMDA neurotransmission. The present study tested whether the effect of tDCS is reflected in gamma-band ASSRs during a 40 Hz stimulation. Using a double-blind, randomized, crossover study, we performed magnetoencephalography (MEG) and measured the ASSR in 24 healthy participants during 40 Hz of auditory stimulation after prefrontal tDCS (2 mA) or sham (i...
2018: PloS One
https://www.readbyqxmd.com/read/29488040/did-you-listen-to-the-beat-auditory-steady-state-responses-in-the-human-electroencephalogram-at-4-and-7-hz-modulation-rates-reflect-selective-attention
#13
Manuela Jaeger, Martin G Bleichner, Anna-Katharina R Bauer, Bojana Mirkovic, Stefan Debener
The acoustic envelope of human speech correlates with the syllabic rate (4-8 Hz) and carries important information for intelligibility, which is typically compromised in multi-talker, noisy environments. In order to better understand the dynamics of selective auditory attention to low frequency modulated sound sources, we conducted a two-stream auditory steady-state response (ASSR) selective attention electroencephalogram (EEG) study. The two streams consisted of 4 and 7 Hz amplitude and frequency modulated sounds presented from the left and right side...
February 27, 2018: Brain Topography
https://www.readbyqxmd.com/read/29487299/differential-modulation-of-the-auditory-steady-state-response-and-inhibitory-gating-by-chloral-hydrate-anesthesia
#14
Yuchen Wang, Lanlan Ma, Xuejiao Wang, Ling Qin
Auditory steady state response (ASSR) and inhibitory gating (IG) are electrophysiological examinations commonly used to evaluate the sensory and cognitive functions of the brain. In some clinic examinations and animal experiments, general anesthesia is necessary to conduct electrophysiological recordings. However, the effects of anesthesia on ASSR and IG remain unclear. For this reason, we recorded local field potentials though electrodes implanted in different brain areas of rats: the auditory cortex (AC), hippocampus (HC), amygdala (AMY), and prefrontal cortex (PFC), and compared the characteristics of ASSR and IG under anesthetized and conscious conditions...
February 27, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29415081/auditory-steady-state-responses-in-primary-and-non-primary-regions-of-the-auditory-cortex-in-neonatal-ventral-hippocampal-lesion-rats
#15
Sibin Li, Lanlan Ma, Yuchen Wang, Xuejiao Wang, Yingzhuo Li, Ling Qin
Auditory steady-state responses (ASSRs) represent the electrophysiological activity of the auditory nervous system in response to a periodic acoustic stimulus. Spectrogram analysis can reveal the frequency and phase information entrained in ASSRs. Clinically, the ASSR is used to detect abnormalities in electroencephalographs obtained from schizophrenia patients, who show reduced power and phase locking of ASSRs. The neonatal ventral hippocampal lesion (NVHL) rat is a widely used model to investigate the neurodevelopmental mechanisms of schizophrenia...
2018: PloS One
https://www.readbyqxmd.com/read/29378459/auditory-brainstem-middle-and-late-latency-responses-to-short-gaps-in-noise-at-different-presentation-rates
#16
Khalid Alhussaini, Jorge Bohorquez, Rafael E Delgado, Ozcan Ozdamar
OBJECTIVE: The effects of rate on auditory-evoked potentials (AEP) to short noise gaps (12 ms) recorded at high sampling rates using wide-band filters were investigated. DESIGN: Auditory brainstem (ABR), middle latency (MLR), late latency (LLR) and steady-state (ASSR) responses were simultaneously recorded in adult subjects at four gap rates (0.5, 1, 5 and 40 Hz). Major components (V, Na, Pa, Nb, Pb, N1 and P2) were identified at each rate and analysed for latency/amplitude characteristics...
January 29, 2018: International Journal of Audiology
https://www.readbyqxmd.com/read/29337239/background-suppression-and-its-relation-to-foreground-processing-of-speech-versus-non-speech-streams
#17
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, that is, auditory steady-state response (ASSR)...
March 1, 2018: Neuroscience
https://www.readbyqxmd.com/read/29319012/using-auditory-steady-state-responses-for-measuring-hearing-protector-occlusion-effect
#18
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
#19
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
#20
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...
January 2018: HNO
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