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acoustic analysis

Chris J James, Chadlia Karoui, Marie-Laurence Laborde, Benoît Lepage, Charles-Édouard Molinier, Marjorie Tartayre, Bernard Escudé, Olivier Deguine, Mathieu Marx, Bernard Fraysse
OBJECTIVE: Normal-hearing subjects listening to acoustic simulations of cochlear implants (CI) can obtain sentence recognition scores near 100% in quiet and in 10 dB signal-to-noise ratio (SNR) noise with acute exposure. However, average sentence recognition scores for real CI listeners are generally lower, even after months of experience, and there is a high degree of heterogeneity. Our aim was to identify the relative importance and strength of factors that prevent CI listeners from achieving early, 1-mo scores as high as those for normal-hearing-listener acoustic simulations...
October 17, 2018: Ear and Hearing
G Lafay, M Rossignol, N Misdariis, M Lagrange, J-F Petiot
This paper introduces a new experimental protocol for studying mental representations of urban soundscapes through a simulation process. Subjects are asked to create a full soundscape by means of a dedicated software tool, coupled with a structured sound data set. This paradigm is used to characterize urban sound environment representations by analyzing the sound classes that were used to simulate the auditory scenes. A rating experiment of the soundscape pleasantness using a seven-point bipolar semantic scale is conducted to further refine the analysis of the simulated urban acoustic scenes...
October 17, 2018: Behavior Research Methods
Peyton Teutsch, Carolyn E Jones, Mara E Kaiser, Natasha Avalon Gardner, Miranda M Lim
Study Objectives: Traumatic brain injury (TBI) and posttraumatic stress disorder (PTSD) commonly cooccur. Approaches to research and treatment of these disorders have been segregated, despite overlapping symptomology. We and others have hypothesized that comorbid TBI + PTSD generates worse symptoms than either condition alone. We present a mouse model of comorbid TBI + PTSD to further explore this condition. Methods: A mouse model of TBI + PTSD was generated using the single prolonged stress (SPS) protocol in combination with the controlled cortical impact (CCI) protocol...
2018: Behavioural Neurology
Chunyu Qiu, Shuqing Ma, Yu Chen, Zhou Meng, Jianfei Wang
A method is developed in this paper to calculate the spatial gain of a vertical line array when the plane-wave assumption is not applicable and when the oceanic ambient noise is correlated. The proposed optimal array gain (OAG), which can evaluate the array's performance and effectively guide its deployment, can be given by an equation in which the noise gain (NG) is subtracted from the signal gain (SG); hence, a high SG and a negative NG can enhance the performance of the array. OAGs and SGs with different array locations are simulated and analyzed based on the sound propagation properties of the direct-arrival zone (DAZ) and the reliable acoustic path (RAP) using ray theory...
October 15, 2018: Sensors
Li-Ann Leow, Aya Uchida, Jamie-Lee Egberts, Stephan Riek, Ottmar V Lipp, James Tresilian, Welber Marinovic
Motor actions can be released much sooner than normal when the go-signal is of very high intensity (> 100dBa). Although statistical evidence from individual studies has been mixed, it has been assumed that sternocleidomastoid (SCM) muscle activity could be used to distinguish between two neural circuits involved in movement triggering. We summarized meta-analytically the available evidence for this hypothesis, comparing the difference in premotor reaction time (RT) of actions where SCM activity was elicited (SCM+ trials) by loud acoustic stimuli against trials in which it was absent (SCM- trials)...
October 13, 2018: Neuroscience
K Tretbar, M Basilowski, K Wiedmann, C Bartels, P Heßmann, M Kownatka, J Signerski-Krieger, N Scherbaum, S Meuret, M Fuchs, J Wiltfang, B Kis, M Abdel-Hamid
BACKGROUND: Hearing-impairment can lead to a reduced quality of life and thus represents a vulnerability factor for mental disorders. OBJECTIVE: This study represents the first psychiatric analysis of subjective quality of life and depression in people with hearing-impairment in Germany. MATERIALS AND METHODS: The patient group included 30 hearing-impaired participants (27 women, 3 men) with a current or previous mental disorder and/or psychiatric/psychotherapeutic treatment (age: mean, M = 49...
October 15, 2018: HNO
Christian J Sumner, Toby T Wells, Christopher Bergevin, Joseph Sollini, Heather A Kreft, Alan R Palmer, Andrew J Oxenham, Christopher A Shera
Frequency analysis of sound by the cochlea is the most fundamental property of the auditory system. Despite its importance, the resolution of this frequency analysis in humans remains controversial. The controversy persists because the methods used to estimate tuning in humans are indirect and have not all been independently validated in other species. Some data suggest that human cochlear tuning is considerably sharper than that of laboratory animals, while others suggest little or no difference between species...
October 15, 2018: Proceedings of the National Academy of Sciences of the United States of America
Xiaofei Li, Yueli Sun, Zhilun Zhou, Dongye Zhang, Jian Jiao, Minyi Hu, Chaudhry Raza Hassan, Yi-Xian Qin
The purpose of this study was to evaluate the effect of low-intensity ultrasound on articular cartilage and subchondral bone alterations in joints under normal and functional disuse conditions during osteoarthritis (OA) progression. Total of thirty 5-mo-old female Sprague-Dawley rats were randomly assigned to six groups (n = 5/group): age-matched group, OA group, OA + ultrasound (US) group, hindlimb suspension (HLS) group, HLS + OA group and HLS + OA + US group. The surgical anterior cruciate ligament was used to induce OA in the right knee joints...
October 12, 2018: Ultrasound in Medicine & Biology
Florian Pausch, Lukas Aspöck, Michael Vorländer, Janina Fels
Theory and implementation of acoustic virtual reality have matured and become a powerful tool for the simulation of entirely controllable virtual acoustic environments. Such virtual acoustic environments are relevant for various types of auditory experiments on subjects with normal hearing, facilitating flexible virtual scene generation and manipulation. When it comes to expanding the investigation group to subjects with hearing loss, choosing a reproduction system which offers a proper integration of hearing aids into the virtual acoustic scene is crucial...
January 2018: Trends in Hearing
Patrice Adret, Kimberly A Dingess, Christini B Caselli, Jan Vermeer, Jesus M Martínez, Jossy C Luna Amancio, Silvy M van Kuijk, Lucero M Hernani Lineros, Robert B Wallace, Eduardo Fernandez-Duque, Anthony Di Fiore
Long-range vocal communication in socially monogamous titi monkeys is mediated by the production of loud, advertising calls in the form of solos, duets, and choruses. We conducted a power spectral analysis of duets and choruses (simply "duets" hereafter) followed by linear discriminant analysis using three acoustic parameters-dominant frequency of the combined signal, duet sequence duration, and pant call rate-comparing the coordinated vocalizations recorded from 36 family groups at 18 sites in Bolivia, Peru and Ecuador...
October 13, 2018: Animals: An Open Access Journal From MDPI
De Cai, Terence T W Wong, Liren Zhu, Junhui Shi, Sung-Liang Chen, Lihong V Wang
Optical-resolution photoacoustic microscopy (OR-PAM) is an emerging imaging modality for studying biological tissues. However, in conventional single-view OR-PAM, the lateral and axial resolutions-determined optically and acoustically, respectively-are highly anisotropic. In this Letter, we introduce dual-view OR-PAM to improve axial resolution, achieving three-dimensional (3D) resolution isotropy. We first use 0.5 μm polystyrene beads and carbon fibers to validate the resolution isotropy improvement. Imaging of mouse brain slices further demonstrates the improved resolution isotropy, revealing the 3D structure of cell nuclei in detail, which facilitates quantitative cell nuclear analysis...
October 15, 2018: Optics Letters
Sara L Johnson, Douglas A Christensen, Christopher R Dillon, Allison Payne
In focused ultrasound (FUS) thermal ablation of diseased tissue, acoustic beam and thermal simulations enable treatment planning and optimization. In this study, a treatment-planning methodology that uses the hybrid angular spectrum (HAS) method and the Pennes' bioheat equation (PBHE) is experimentally validated in homogeneous tissue-mimicking phantoms. Simulated three-dimensional temperature profiles are compared to volumetric MR thermometry imaging (MRTI) of FUS sonications in the phantoms, whose acoustic and thermal properties are independently measured...
October 15, 2018: International Journal of Hyperthermia
Rodrigo San-Martin, Maria Inês Zimiani, Claudemiro Noya, Milton Augusto Vendramini Ávila, Rosana Shuhama, Cristina Marta Del-Ben, Paulo Rossi Menezes, Francisco José Fraga, Cristiane Salum
Prepulse inhibition (PPI) test has been widely used to evaluate sensorimotor gating. In humans, deficits in this mechanism are measured through the orbicularis muscle response using electromyography (EMG). Although this mechanism can be modulated by several brain structures and is impaired in some pathologies as schizophrenia and bipolar disorder, neural PPI evaluation is rarely performed in humans. Since eye blinks are a consequence of PPI stimulation, they strongly contaminate the electroencephalogram (EEG) signal...
2018: Frontiers in Neuroscience
Paul Carter, Florian Beutler, Will J Percival, Chris Blake, Jun Koda, Ashley J Ross
Low-redshift measurements of baryon acoustic oscillations (BAO) measure the late-time evolution of the Universe and are a vital probe of dark energy. Over the past decade both the 6-degree Field Galaxy Survey (6dFGS) and Sloan Digital Sky Survey Main Galaxy Sample (SDSS MGS) have provided important distance constraints at [Formula: see text] < 0.3. In this paper we re-evaluate the cosmological information from the BAO detection in 6dFGS making use of halo occupation distribution (HOD)-populated COmoving Lagrangian Acceleration (COLA) mocks for an accurate covariance matrix and take advantage of the now commonly implemented technique of density field reconstruction...
December 2018: Monthly Notices of the Royal Astronomical Society
C Y Wang, J Wen, Y H Zhou, S Li, Y Zhang, W Lu, J Li
Objective: A retrospective analysis of the predictive value of acoustic radiation force impulse (ARFI) elastography for esophageal varices in post-hepatitis B cirrhosis patients. Methods: 124 patients with post-hepatitis B cirrhosis who were admitted to Tianjin Second People's Hospital from August 2016 to August 2017 were selected. According to the shape of esophageal varices under gastroscopy and the risk of bleeding, patients were divided into 4 groups, none, mild, moderate and severe. In ARFI mode, the VTQ function was used to detect the VTQ values of the liver and spleen...
July 20, 2018: Zhonghua Gan Zang Bing za Zhi, Zhonghua Ganzangbing Zazhi, Chinese Journal of Hepatology
Gustavo Noffs, Thushara Perera, Scott Camaron Kolbe, Camille Jessica Shanahan, Frederique Maria Christina Boonstra, Andrew Evans, Helmut Butzkueven, Anneke van der Walt, Adam Phillip Vogel
IMPORTANCE: Multiple sclerosis produces neurological impairments that are variable in duration, severity and quality. Speech is frequently impaired, resulting in decreased communication skills and quality of life. Advancements in technology now makes it possible to use quantitative acoustic assessment of speech as biomarkers of disease progression. OBSERVATIONS: Four domains of speech have been identified: articulation (slow articulation and imprecise consonants), voice (pitch and loudness instability), respiration (decreased phonatory time and expiratory pressure) and prosody (longer and frequent pauses, deficient loudness control)...
October 11, 2018: Autoimmunity Reviews
Thierry Baasch, Peter Reichert, Stefan Lakämper, Nadia Vertti-Quintero, Gamuret Hack, Xavier Casadevall I Solvas, Andrew deMello, Rudiyanto Gunawan, Jürg Dual
The acoustic compressibility of Caenorhabditis elegans is a necessary parameter for further understanding the underlying physics of acoustic manipulation techniques of this widely used model organism in biological sciences. In this work, numerical simulations were combined with experimental trajectory velocimetry of L1 C. elegans larvae to estimate the acoustic compressibility of C. elegans. A method based on bulk acoustic wave acoustophoresis was used for trajectory velocimetry experiments in a microfluidic channel...
September 22, 2018: Biophysical Journal
Joanna Jackowska, Hanna Klimza, Natalia Zagozda, Marc Remacle, Waldemar Wojnowski, Krzysztof Piersiala, Małgorzata Wierzbicka
RATIONALE: The coincidence of an idiopathic unilateral vocal fold paresis and hereditary hemorrhagic telenagiectasia (HHT) is extremely rare and has not been described in the available literature yet. PATIENTS CONCERNS: A 55-year-old female was admitted to hospital due to acute onset of hoarseness, voice fatigue, and effort dyspnea. In the past, the patient was diagnosed with HHT and on admission presented characteristic vascular lesions in the oral cavity. She reported also experiencing a moderate epistaxis at least once per month...
October 2018: Medicine (Baltimore)
Gary Allwood, Xuhao Du, Mary Webberley, Adam Osseiran, Barry James Marshall
With the invention of the electronic stethoscope and other similar recording and data logging devices, acoustic signal processing concepts and methods can now be applied to bowel sounds. In this paper, the literature pertaining to acoustic signal processing for bowel sound analysis is reviewed and discussed. The article outlines some of the fundamental approaches and machine learning principles that may be used in bowel sound analysis. The advances in signal processing techniques that have allowed useful information to be obtained from bowel sounds from an historical perspective is provided...
October 11, 2018: IEEE Reviews in Biomedical Engineering
A Maskay, D M Hummels, M Pereira da Cunha
Surface acoustic wave resonators (SAWR) have found widespread usage in various modern consumer radiofrequency (RF) communications electronics, such as cellular phones, wireless devices, GPS devices, frequency control, and sensing applications. External mechanical vibrations modify a SAWR relative dimensions and the substrate's elastic properties, which alter the device's acoustic wave propagation velocity, and ultimately causes the SAWR RF response to change. Detecting vibrations is desirable for dynamic strain, or vibration sensing applications...
October 11, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
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