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auditory evoked responses

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https://www.readbyqxmd.com/read/28801194/medial-septum-modulates-hippocampal-gamma-activity-and-prepulse-inhibition-in-an-n-methyl-d-aspartate-receptor-antagonist-model-of-schizophrenia
#1
L Stan Leung, Jingyi Ma
We reviewed the participation of the septohippocampal system in an animal model of schizophrenia that was acutely induced by systemic injection of an N-methyl-d-aspartate (NMDA) receptor antagonist such as phencyclidine, MK-801 and ketamine. The NMDA receptor antagonist-induced model of schizophrenia is characterized by behavioral and electrophysiological disruptions, including a decrease in prepulse inhibition of the acoustic startle response (PPI), hyperlocomotion, decrease in gating of hippocampal auditory evoked potentials and robust increase in hippocampal gamma (30-100Hz) oscillations...
August 8, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28789960/multisensory-integration-in-orienting-behavior-pupil-size-microsaccades-and-saccades
#2
Chin-An Wang, Gunnar Blohm, Jeff Huang, Susan E Boehnke, Douglas P Munoz
Signals from different sensory modalities are integrated in the brain to optimize behavior. Although multisensory integration has been demonstrated in saccadic eye movements, its influence on other orienting responses, including pupil size and microsaccades, is still poorly understood. We examined human gaze orienting responses following presentation of visual, auditory, or combined audiovisual stimuli. Transient pupil dilation and microsaccade inhibition were evoked shortly after the appearance of a salient stimulus...
August 5, 2017: Biological Psychology
https://www.readbyqxmd.com/read/28781049/role-of-the-cerebellum-in-adaptation-to-delayed-action-effects
#3
Liyu Cao, Domenica Veniero, Gregor Thut, Joachim Gross
Actions are typically associated with sensory consequences. For example, knocking at a door results in predictable sounds. These self-initiated sensory stimuli are known to elicit smaller cortical responses compared to passively presented stimuli, e.g., early auditory evoked magnetic fields known as M100 and M200 components are attenuated. Current models implicate the cerebellum in the prediction of the sensory consequences of our actions. However, causal evidence is largely missing. In this study, we introduced a constant delay (of 100 ms) between actions and action-associated sounds, and we recorded magnetoencephalography (MEG) data as participants adapted to the delay...
July 25, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28779851/a-tale-of-two-sites-differential-impairment-of-frequency-and-duration-mismatch-negativity-across-a-primarily-inpatient-versus-a-primarily-outpatient-site-in-schizophrenia
#4
Migyung Lee, Pejman Sehatpour, Elisa C Dias, Gail S Silipo, Joshua T Kantrowitz, Antigona M Martinez, Daniel C Javitt
Deficits in mismatch negativity (MMN) generation are among the best replicated neurophysiological deficits in schizophrenia, with reduced amplitude reflecting impaired information processing at the level of supratemporal auditory cortex. Differential patterns of MMN dysfunction according to deviant types have been reported across studies, with some research groups showing impairment in duration MMN but not frequency MMN, and other research groups reporting both findings. We evaluate the hypothesis that recruitment setting, reflecting current functional status, might be an important determinant of the pattern of MMN dysfunction...
August 2, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28772264/development-of-auditory-evoked-responses-in-normally-developing-preschool-children-and-children-with-autism-spectrum-disorder
#5
Julia M Stephen, Dina E Hill, Amanda Peters, Lucinda Flynn, Tongsheng Zhang, Yoshio Okada
The cortical responses to auditory stimuli undergo rapid and dramatic changes during the first 3 years of life in normally developing (ND) children, with decreases in latency and changes in amplitude in the primary peaks. However, most previous studies have focused on children >3 years of age. The analysis of data from the early stages of development is challenging because the temporal pattern of the evoked responses changes with age (e.g., additional peaks emerge with increasing age) and peak latency decreases with age...
August 4, 2017: Developmental Neuroscience
https://www.readbyqxmd.com/read/28771568/laminar-differences-in-response-to-simple-and-spectro-temporally-complex-sounds-in-the-primary-auditory-cortex-of-ketamine-anesthetized-gerbils
#6
Markus K Schaefer, Manfred Kössl, Julio C Hechavarría
In mammals, acoustic communication plays an important role during social behaviors. Despite their ethological relevance, the mechanisms by which the auditory cortex represents different communication call properties remain elusive. Recent studies have pointed out that communication-sound encoding could be based on discharge patterns of neuronal populations. Following this idea, we investigated whether the activity of local neuronal networks, such as those occurring within individual cortical columns, is sufficient for distinguishing between sounds that differed in their spectro-temporal properties...
2017: PloS One
https://www.readbyqxmd.com/read/28769835/music-of-the-7ts-predicting-and-decoding-multivoxel-fmri-responses-with-acoustic-schematic-and-categorical-music-features
#7
Michael A Casey
Underlying the experience of listening to music are parallel streams of auditory, categorical, and schematic qualia, whose representations and cortical organization remain largely unresolved. We collected high-field (7T) fMRI data in a music listening task, and analyzed the data using multivariate decoding and stimulus-encoding models. Twenty subjects participated in the experiment, which measured BOLD responses evoked by naturalistic listening to twenty-five music clips from five genres. Our first analysis applied machine classification to the multivoxel patterns that were evoked in temporal cortex...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28761523/the-use-of-event-related-potential-p300-and-neuropsychological-testing-to-evaluate-cognitive-impairment-in-mild-traumatic-brain-injury-patients
#8
Puneet Nandrajog, Zamzuri Idris, Wan Nor Azlen, Alwani Liyana, Jafri Malin Abdullah
BACKGROUND: The aim of the study is to compare the amplitude and latency of the P300 event-related potential (ERP) component between a control group and patients after mild traumatic brain injury (mTBI) during 1-7 days (short duration) and 2-3 months (long duration), and to compare the outcome of neuropsychological tests between the long duration postinjury and control study groups. MATERIALS AND METHODS: We studied responses to auditory stimulation in two main and one subgroups, namely the control healthy group (19 patients, both ERP and neuropsychology test done), the mTBI 1 group (17 patients, only ERP done within 7 days after injury), and the mTBI 2 subgroup (the 17 mTBI 1 patients in whom a repeated ERP together with neuropsychological testing was done at 2-3 months postinjury)...
July 2017: Asian Journal of Neurosurgery
https://www.readbyqxmd.com/read/28760858/segregation-of-visual-response-properties-in-the-mouse-superior-colliculus-and-their-modulation-during-locomotion
#9
Shinya Ito, David A Feldheim, Alan M Litke
The superior colliculus (SC) receives direct input from the retina and integrates it with information about sound, touch and state of the animal that is relayed from other parts of the brain to initiate specific behavioral outcomes. The superficial SC layers (sSC) contain cells that respond to visual stimuli, while the deep SC layers (dSC) contain cells that also respond to auditory and somatosensory stimuli. Here we used a large-scale silicon probe recording system to examine the visual response properties of SC cells of head-fixed and alert male mice...
July 31, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28756239/trading-of-dynamic-interaural-time-and-level-difference-cues-and-its-effect-on-the-auditory-motion-onset-response-measured-with-electroencephalography
#10
Christian F Altmann, Ryuhei Ueda, Benoit Bucher, Shigeto Furukawa, Kentaro Ono, Makio Kashino, Tatsuya Mima, Hidenao Fukuyama
Interaural time (ITD) and level differences (ILD) constitute the two main cues for sound localization in the horizontal plane. Despite extensive research in animal models and humans, the mechanism of how these two cues are integrated into a unified percept is still far from clear. In this study, our aim was to test with human electroencephalography (EEG) whether integration of dynamic ITD and ILD cues is reflected in the so-called motion-onset response (MOR), an evoked potential elicited by moving sound sources...
July 27, 2017: NeuroImage
https://www.readbyqxmd.com/read/28755914/cochlear-nerve-action-potential-monitoring-for-preserving-function-of-an-unseen-cochlear-nerve-in-vestibular-schwannoma-surgery
#11
Mami Ishikawa, Atsuhiro Kojima, Satoshi Terao, Mutsumi Nagai, Gen Kusaka, Heiji Naritaka
BACKGROUND: Intraoperative monitoring of cochlear nerve action potential (CNAP) has been used in patients with small vestibular schwannoma (<15 mm) to preserve cochlear nerve function. We performed surgery for a larger vestibular schwannoma under CNAP monitoring and preserved cochlear nerve function, as compared with that in 10 normal patients showing hemifacial spasm. CASE DESCRIPTION: We report the case of a patient with a 26-mm vestibular schwannoma and normal hearing function who underwent neurosurgery under electrophysiological monitoring of the facial and cochlear nerves...
July 26, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28753474/age-related-changes-in-envelope-following-responses-at-equalized-peripheral-or-central-activation
#12
Jesyin Lai, Alexandra L Sommer, Edward L Bartlett
Previous work has debated about the comparisons of hearing abilities faced with alterations in hearing thresholds and evoked potentials between groups following acoustic trauma- or age-related changes. This study compares envelope-following responses (EFRs) of young and aged rats when sound levels were matched according to (1) wave I amplitudes of auditory brainstem responses (ABRs) elicited by 8-kHz tones or (2) EFR amplitudes evoked by sinusoidally amplitude-modulated (SAM) tones at 100% depth. Matched wave I amplitudes across age corresponded to approximately 20-dB sound level differences...
June 24, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/28753163/cortical-processing-of-vocal-and-nonvocal-sounds-in-cochlear-implanted-children-an-electrophysiological-study
#13
David Bakhos, John Galvin, Sylvie Roux, Emmanuel Lescanne, Nicole Bruneau
OBJECTIVES: For prelingually deaf children, cochlear implants (CIs) can restore auditory input to the auditory cortex and the ability to acquire spoken language. Language development is strongly intertwined with voice perception. The aim of this electrophysiological study was to investigate human voice processing using measures of cortical auditory evoked potentials (AEPs) in pediatric CI users. DESIGN: Cortical AEPs were measured in 8 CI children (4 to 12 years old) with good auditory and language performance and 8 normal-hearing (NH) age-matched controls...
July 27, 2017: Ear and Hearing
https://www.readbyqxmd.com/read/28752567/auditory-visual-integration-modulates-location-specific-repetition-suppression-of-auditory-responses
#14
Talia Shrem, Micah M Murray, Leon Y Deouell
Space is a dimension shared by different modalities, but at what stage spatial encoding is affected by multisensory processes is unclear. Early studies observed attenuation of N1/P2 auditory evoked responses following repetition of sounds from the same location. Here, we asked whether this effect is modulated by audiovisual interactions. In two experiments, using a repetition-suppression paradigm, we presented pairs of tones in free field, where the test stimulus was a tone presented at a fixed lateral location...
July 28, 2017: Psychophysiology
https://www.readbyqxmd.com/read/28750416/electrophysiological-evidence-for-the-sources-of-the-masking-level-difference
#15
Cynthia G Fowler
Purpose: The purpose of this review article is to review evidence from auditory evoked potential studies to describe the contributions of the auditory brainstem and cortex to the generation of the masking level difference (MLD). Method: A literature review was performed, focusing on the auditory brainstem, middle, and late latency responses used in protocols similar to those used to generate the behavioral MLD. Results: Temporal coding of the signals necessary for generating the MLD occurs in the auditory periphery and brainstem...
July 26, 2017: Journal of Speech, Language, and Hearing Research: JSLHR
https://www.readbyqxmd.com/read/28744995/idiopathic-sudden-sensorineural-hearing-loss-and-m%C3%A3-ni%C3%A3-re-syndrome-the-role-of-cerebral-venous-drainage
#16
Marco Matteo Ciccone, Pietro Scicchitano, Michele Gesualdo, Francesca Cortese, Annapaola Zito, Fabio Manca, Barbara Boninfante, Pasquale Recchia, Domenico Leogrande, Domenico Viola, Marialessia Damiani, Valeria Gambacorta, Antonio Piccolo, Vincenzo De Ceglie, Nicola Quaranta
AIM: to evaluate the influence of cerebral venous drainage on the pathogenesis of idiopathic sudden sensorineural hearing loss (ISSHL) and Ménière syndrome (MD). METHODS: we enrolled 59 consecutive patients (32 males, mean age 53.05+15.37 years): 40 ISSHL and 19 MD. All underwent physical examination, biochemical evaluation (glycemic and lipid profile, viral serology, C reactive protein, etc), audiometric (tonal, vocal, vestibular evoked myogenic potentials and auditory brainstem response test) and impedentiometric examination...
July 26, 2017: Clinical Otolaryngology
https://www.readbyqxmd.com/read/28739134/nmda-receptor-modulation-by-dextromethorphan-and-acute-stress-selectively-alters-electroencephalographic-indicators-of-partial-report-processing
#17
Lisa J Weckesser, Sören Enge, Philipp Riedel, Clemens Kirschbaum, Robert Miller
Proceeding from a biophysical network model, the present study hypothesized that glutamatergic neurotransmission across the NMDA receptor (NMDAR) plays a key role in visual perception and its modulation by acute stress. To investigate these hypotheses, behavioral and electroencephalographic (EEG) indicators of partial report task processing were assessed in twenty-four healthy young men who randomly received a non-competitive NMDAR antagonist (0.8 mg/kg dextromethorphan, DXM) or a placebo, and concurrently accomplished a stress-induction (MAST) or control protocol in three consecutive sessions...
July 21, 2017: European Neuropsychopharmacology: the Journal of the European College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28736519/isolating-discriminant-neural-activity-in-the-presence-of-eye-movements-and-concurrent-task-demands
#18
Jon Touryan, Vernon J Lawhern, Patrick M Connolly, Nima Bigdely-Shamlo, Anthony J Ries
A growing number of studies use the combination of eye-tracking and electroencephalographic (EEG) measures to explore the neural processes that underlie visual perception. In these studies, fixation-related potentials (FRPs) are commonly used to quantify early and late stages of visual processing that follow the onset of each fixation. However, FRPs reflect a mixture of bottom-up (sensory-driven) and top-down (goal-directed) processes, in addition to eye movement artifacts and unrelated neural activity. At present there is little consensus on how to separate this evoked response into its constituent elements...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28735013/simultaneous-intrinsic-signal-imaging-of-auditory-and-visual-cortex-reveals-profound-effects-of-acute-hearing-loss-on-visual-processing
#19
Manuel Teichert, Jürgen Bolz
It has been suggested that primary sensory cortices do not work in isolation but receive subthreshold inputs originating from other senses. However, repercussions of an acute loss of one sense on multimodal sensory processing remain elusive. Here we investigated the early effects of acute hearing loss on visual processing in adult mice. For this, we developed a method to simultaneously map the primary auditory (A1) and visual cortex (V1) using periodic intrinsic optical imaging. We found that reducing sound evoked A1 responsiveness due to the induction of conductive hearing loss (CHL) led to a concomitant increase of visually driven V1 activity...
July 19, 2017: NeuroImage
https://www.readbyqxmd.com/read/28730834/resveratrol-alleviates-ethanol-induced-hormonal-and-metabolic-disturbances-in-the-rat
#20
J Popelář, M Díaz Gómez, J Lindovský, N Rybalko, J Burianová, T Oohashi, J Syka
Brain-specific link protein Bral2 represents a substantial component of perineuronal nets (PNNs) enwrapping neurons in the central nervous system. To elucidate the role of Bral2 in auditory signal processing, the hearing function in knockout Bral2(-/-) (KO) mice was investigated using behavioral and electrophysiological methods and compared with wild type Bral2(+/+) (WT) mice. The amplitudes of the acoustic startle reflex (ASR) and the efficiency of the prepulse inhibition of ASR (PPI of ASR), produced by prepulse noise stimulus or gap in continuous noise, was similar in 2-week-old WT and KO mice...
July 18, 2017: Physiological Research
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