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auditory evoked responses

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https://www.readbyqxmd.com/read/28542290/new-paradigm-for-auditory-paired-pulse-suppression
#1
Nobuyuki Takeuchi, Shunsuke Sugiyama, Koji Inui, Kousuke Kanemoto, Makoto Nishihara
Sensory gating is a mechanism of sensory processing used to prevent an overflow of irrelevant information, with some indexes, such as prepulse inhibition (PPI) and P50 suppression, often utilized for its evaluation. In addition, those are clinically important for diseases such as schizophrenia. In the present study, we investigated long-latency paired-pulse suppression of change-related cortical responses using magnetoencephalography. The test change-related response was evoked by an abrupt increase in sound pressure by 15 dB in a continuous sound composed of a train of 25-ms pure tones at 65 dB...
2017: PloS One
https://www.readbyqxmd.com/read/28539421/sound-making-actions-lead-to-immediate-plastic-changes-of-neuromagnetic-evoked-responses-and-induced-beta-band-oscillations-during-perception
#2
Bernhard Ross, Masihullah Barat, Takako Fujioka
Auditory and sensorimotor brain areas interact during the action-perception cycle of sound making. Neurophysiological evidence of a feedforward model of the action and its outcome has been associated with attenuation of the N1 wave of auditory evoked responses elicited by self-generated sounds, such as vocalization or playing a musical instrument. Moreover, neural oscillations at beta-band frequencies have been related to predicting the sound outcome after action initiation. We hypothesized that a newly learned action-perception association would immediately modify interpretation of the sound during subsequent listening...
May 24, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28539242/manganese-enhanced-mr-imaging-memri-combined-with-electrophysiology-in-the-study-of-cross-modal-plasticity-in-binocularly-blind-rats
#3
Zuohua Tang, Lingjie Wu, Zebin Xiao, Xinghuai Sun, Xiaoyuan Feng, Qian Chen, Jiawen Fan, Jie Wang, Wentao Wang, Jianfeng Luo, Lixin Jin
Our study aimed to determine and verify the establishment of visual to auditory cross-modal plasticity using manganese-enhanced MR imaging (MEMRI) combined with examinations of the visual evoked potential (VEP), auditory brainstem response (ABR) and bilateral visual cortex response to a bilateral auditory stimulus (AVR). Fourteen healthy male Sprague-Dawley newborn rats were randomly divided into 2 groups (n=7 per group). Optic nerve transection was performed in the 7 rats of Group A three weeks after birth to obtain binocularly blind models, and the 7 rats of Group B were maintained as the control group...
May 21, 2017: International Journal of Developmental Neuroscience
https://www.readbyqxmd.com/read/28537687/the-effect-of-optimizing-eabr-parameters-in-artificial-cochlear-implantation-for-auditory-rehabilitation
#4
H-L Yang, Z Liu
OBJECTIVE: The objective of the present study was to observe the relationship between V extraction rate and threshold value of electrically evoked auditory brainstem response (EABR) waves in artificial cochlear implantation, in order to optimize EABR parameters for improving auditory rehabilitation. PATIENTS AND METHODS: Thirty patients without residual hearing and treated with artificial cochlear implants were selected. The experimental group included 17 cases with normal cochlear morphology, four with large vestibular aqueduct syndrome (LVAS), six with Mondini malformation, and three with internal auditory canal stenosis...
May 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28535131/detection-of-deafness-in-puppies-using-a-hand-held-otoacoustic-emission-screener
#5
Michael H Sims, Erin Plyler, Ashley Harkrider, Karen McLucas
The purpose of this study was to evaluate the use of a hand-held otoacoustic emissions screener to detect deafness in puppies. Specifically, distortion product otoacoustic emissions were recorded from 34 puppies (both sexes) of a variety of breeds, from 6-10 wk of age, and the results were compared to brainstem auditory evoked responses (BAER) recorded from the same puppies. Recordings were obtained from both ears in awake or lightly anesthetized puppies, and the results from each ear were compared. In all 62 ears that had normal BAERs, the distortion product otoacoustic emissions screener gave a response of "Pass...
May 23, 2017: Journal of the American Animal Hospital Association
https://www.readbyqxmd.com/read/28534728/hearing-loss-and-age-induced-changes-in-the-central-auditory-system-measured-by-the-p3-response-to-small-changes-in-frequency
#6
Kathy R Vander Werff, Kerrie L Nesbitt
BACKGROUND: Recent behavioral studies have suggested that individuals with sloping audiograms exhibit localized improvements in frequency discrimination in the frequency region near the drop in hearing. Auditory-evoked potentials may provide evidence of such cortical plasticity and reorganization of frequency maps. PURPOSE: The objective of this study was to evaluate electrophysiological evidence of cortical plasticity related to cortical frequency representation and discrimination abilities in older individuals with high-frequency sensorineural hearing loss (SNHL)...
May 2017: Journal of the American Academy of Audiology
https://www.readbyqxmd.com/read/28534502/engaging-and-disengaging-recurrent-inhibition-coincides-with-sensing-and-unsensing-of-a-sensory-stimulus
#7
Debajit Saha, Wensheng Sun, Chao Li, Srinath Nizampatnam, William Padovano, Zhengdao Chen, Alex Chen, Ege Altan, Ray Lo, Dennis L Barbour, Baranidharan Raman
Even simple sensory stimuli evoke neural responses that are dynamic and complex. Are the temporally patterned neural activities important for controlling the behavioral output? Here, we investigated this issue. Our results reveal that in the insect antennal lobe, due to circuit interactions, distinct neural ensembles are activated during and immediately following the termination of every odorant. Such non-overlapping response patterns are not observed even when the stimulus intensity or identities were changed...
May 23, 2017: Nature Communications
https://www.readbyqxmd.com/read/28527912/implicit-variations-of-temporal-predictability-shaping-the-neural-oscillatory-and-behavioural-response
#8
Sophie K Herbst, Jonas Obleser
Being able to predict when an event will occur (temporal predictability) can help us prepare and time our responses. We here sought to delineate the neural and behavioural corollaries of highly implicit, probabilistic temporal predictability in an auditory foreperiod paradigm. To this end, we measured electroencephalography (EEG) and response times in two independent experiments (total N = 46). Unbeknownst to participants, we induced a probabilistic variation of cue-target delays (i.e., foreperiods) in a pitch-discrimination task on a noise-embedded tone: The smaller the standard deviation of the underlying foreperiod distribution, the more predictable the time of target occurrence should be...
May 17, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28521049/22q11-2-deletion-syndrome-is-associated-with-impaired-auditory-steady-state-gamma-response
#9
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/28516807/neurofeedback-based-enhancement-of-single-trial-auditory-evoked-potentials-feasibility-in-healthy-subjects
#10
Kathryn Rieger, Marie-Helene Rarra, Nicolas Moor, Laura Diaz Hernandez, Anja Baenninger, Nadja Razavi, Thomas Dierks, Daniela Hubl, Thomas Koenig
Previous studies showed a global reduction of the event-related potential component N100 in patients with schizophrenia, a phenomenon that is even more pronounced during auditory verbal hallucinations. This reduction assumingly results from dysfunctional activation of the primary auditory cortex by inner speech, which reduces its responsiveness to external stimuli. With this study, we tested the feasibility of enhancing the responsiveness of the primary auditory cortex to external stimuli with an upregulation of the event-related potential component N100 in healthy control subjects...
May 1, 2017: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/28516227/impairment-in-mismatch-negativity-but-not-repetition-suppression-in-schizophrenia
#11
Brian A Coffman, Sarah M Haigh, Tim K Murphy, Dean F Salisbury
Schizophrenia is characterized by impaired auditory-evoked potentials (AEPs), mismatch negativity (MMN), and sensory gating of AEPs to repeated stimuli (repetition suppression, RS). In the predictive modeling framework, MMN and RS reflect encoding of prediction error and model sharpening, respectively. We compared P50, N100, P200 RS, and pitch and duration MMN in 26 participants diagnosed with schizophrenia (SZ) and 26 matched healthy controls (HC), and assessed relationships between MMN, RS, and SZ diagnosis...
May 17, 2017: Brain Topography
https://www.readbyqxmd.com/read/28504308/brainstem-as-a-developmental-gateway-to-social-attention
#12
Ronny Geva, Ayelet Dital, Dan Ramon, Jessica Yarmolovsky, Maor Gidron, Jacob Kuint
BACKGROUND: Evolution preserves social attention due to its key role in supporting survival. Humans are attracted to social cues from infancy, but the neurobiological mechanisms for the development of social attention are unknown. An evolutionary-based, vertical-hierarchical theoretical model of self-regulation suggests that neonatal brainstem inputs are key for the development of well-regulated social attention. METHODS: Neonates born preterm (N = 44, GA 34 w...
May 15, 2017: Journal of Child Psychology and Psychiatry, and Allied Disciplines
https://www.readbyqxmd.com/read/28498269/real-time-intracochlear-electrocochleography-obtained-directly-through-a-cochlear-implant
#13
Michael S Harris, William Jason Riggs, Kanthaiah Koka, Leonid M Litvak, Prashant Malhotra, Aaron C Moberly, Brendan P O'Connell, Jourdan Holder, Federico Alberto Di Lella, Carlos Mario Boccio, George B Wanna, Robert F Labadie, Oliver F Adunka
HYPOTHESIS: Utilizing the cochlear implant to record electrophysiologic responses during device placement is a feasible and efficacious technique for monitoring near real-time cochlear physiology during and following electrode insertion. BACKGROUND: Minimizing intracochlear trauma during cochlear implantation has emerged as a highly researched area to help improve patient performance. Currently, conventional cochlear implant technology allows for the recording of electrically evoked compound action potentials (eCAPs)...
May 11, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28498265/the-effect-of-systemic-steroid-on-hearing-preservation-after-cochlear-implantation-via-round-window-approach-a-guinea-pig-model
#14
Mun Young Chang, Yoon Chan Rah, Jun Jae Choi, Shin Wook Woo, Yu-Jung Hwang, Hayden Eastwood, Stephen J O'Leary, Jun Ho Lee
HYPOTHESIS: When administered perioperatively, systemic dexamethasone will reduce the hearing loss associated with cochlear implantation (CI) performed via the round window approach. BACKGROUND: The benefits of electroacoustic stimulation have led to interest in pharmacological interventions to preserve hearing after CI. METHODS: Thirty guinea pigs were randomly divided into three experimental groups: a control group; a 3-day infusion group; and a 7-day infusion group...
May 11, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28493808/prestimulus-alpha-oscillations-and-the-temporal-sequencing-of-audio-visual-events
#15
Laetitia Grabot, Anne Kösem, Leila Azizi, Virginie van Wassenhove
Perceiving the temporal order of sensory events typically depends on participants' attentional state, thus likely on the endogenous fluctuations of brain activity. Using magnetoencephalography, we sought to determine whether spontaneous brain oscillations could disambiguate the perceived order of auditory and visual events presented in close temporal proximity, that is, at the individual's perceptual order threshold (Point of Subjective Simultaneity [PSS]). Two neural responses were found to index an individual's temporal order perception when contrasting brain activity as a function of perceived order (i...
May 11, 2017: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/28490194/prepulse-inhibition-of-the-auditory-off-response-a-magnetoencephalographic-study
#16
Eishi Motomura, Koji Inui, Makoto Nishihara, Megumi Tanahashi, Ryusuke Kakigi, Motohiro Okada
A weak preceding sound stimulus attenuates the startle response evoked by an intense sound stimulus. Like startle reflexes, change-related auditory responses are suppressed by a weak leading stimulus (ie, a prepulse). We aim to examine whether a prepulse inhibits cerebral responses to the sound offset and how the prepulse magnitude affects the degree of the prepulse inhibition (PPI). Using magnetoencephalography, we recorded the Off-P50m elicited by an offset of a train sound of 100-Hz clicks in 12 healthy subjects...
May 1, 2017: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/28483259/cortical-auditory-evoked-potentials-in-children-who-stutter
#17
Naema Ismail, Yossra Sallam, Reda Behery, Ameera Al Boghdady
INTRODUCTION: It has been hypothesized that impaired auditory processing influence the occurrence of stuttering. Also, it is suggested that speech perception in children who stutter differed from normal. Auditory processing should be investigated in children who stutter shortly after the onset of stuttering in order to evaluate the extent to which impaired auditory processing contributes to the development of stuttering. CAEPs provide the necessary temporal and spatial resolution to detect differences in auditory processing and the neural activity that is related or time-locked to the auditory stimulus...
June 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/28483258/universal-newborn-hearing-screening-in-southwestern-iran
#18
Nader Saki, Arash Bayat, Reza Hoseinabadi, Soheila Nikakhlagh, Majid Karimi, Rezvan Dashti
OBJECTIVES: The implementation of Neonatal Hearing Screening (NHS) program is still at the preliminary stage particularly in developing countries despite the burden of permanent congenital and early-onset hearing impairment. The purpose of this study was to report results for universal newborn NHS in a cohort of children born in the southwestern region of Iran, as part of a national screening program set up by the Iranian National Health System. METHODS: During this cross-sectional study, which took place between March 2013 and April 2016, healthy newborns were screened using transient evoked otoacoustic emissions (TEOAEs) and automated auditory brainstem responses (AABRs) methods at several points in time as early as possible after birth...
June 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/28482715/hearing-loss-among-high-risk-newborns-admitted-to-a-tertiary-neonatal-intensive-care-unit
#19
May Ahmed Khairy, Walaa Alsharany Abuelhamed, Radwa Sayed Ahmed, Hedayet El Sayed El Fouly, Ismail Mohamed Elhawary
PURPOSE: The aim of this work is to identify the most significant risk factors for hearing impairment in high risk neonates hospitalized at our Neonatal Intensive Care Unit (NICU) and to assess the sensitivity of hearing screening tests. METHODS: This study involved 260 neonates admitted to a tertiary NICU; they were classified into 2 groups; 150 preterm and 110 full terms with risk factors for hearing loss. The hearing screening tests performed were transient evoked otoacoustic emissions (TEOAES) and the automated auditory brain stem response (AABR)...
May 8, 2017: Journal of Maternal-fetal & Neonatal Medicine
https://www.readbyqxmd.com/read/28479322/spike-timing-matters-in-novel-neuronal-code-involved-in-vibrotactile-frequency-perception
#20
Ingvars Birznieks, Richard M Vickery
Skin vibrations sensed by tactile receptors contribute significantly to the perception of object properties during tactile exploration [1-4] and to sensorimotor control during object manipulation [5]. Sustained low-frequency skin vibration (<60 Hz) evokes a distinct tactile sensation referred to as flutter whose frequency can be clearly perceived [6]. How afferent spiking activity translates into the perception of frequency is still unknown. Measures based on mean spike rates of neurons in the primary somatosensory cortex are sufficient to explain performance in some frequency discrimination tasks [7-11]; however, there is emerging evidence that stimuli can be distinguished based also on temporal features of neural activity [12, 13]...
May 22, 2017: Current Biology: CB
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