15 results match your criteria Acta Acustica United With Acustica[Journal]

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A Model for Statistical Regularity Extraction from Dynamic Sounds.

Acta Acust United Acust 2019 Jan-Feb;105(1):1-4. Epub 2018 Dec 7.

Johns Hopkins University, Baltimore, Maryland, United States.

To understand our surroundings, we effortlessly parse our sound environment into sound sources, extracting invariant information-or regularities-over time to build an internal representation of the world around us. Previous experimental work has shown the brain is sensitive to many types of regularities in sound, but theoretical models that capture underlying principles of regularity tracking across diverse sequence structures have been few and far between. Existing efforts often focus on sound patterns rather the stochastic nature of sequences. Read More

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December 2018

Across-frequency processing of interaural time and level differences in perceived lateralization.

Acta Acust United Acust 2018 Sep-Oct;104(5):758-761

Department of Hearing and Speech Sciences, University of Maryland, College Park, MD, USA.

Interaural time and level differences (ITDs and ILDs) contribute to the localization of sound sources; however, reverberation or use of cochlear implants diminishes the role of ITDs. Intracranial lateralization was investigated in normal-hearing listeners using correlated or uncorrelated narrowband noises, where ITDs and/or ILDs from a typical headrelated transfer function were applied. Results showed that ITDs and ILDs contributed to lateralization for correlated noises. Read More

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Auditory brainstem response wave III is correlated with extracellular field potentials from nucleus laminaris of the barn owl.

Acta Acust United Acust 2018 Sep-Oct;104(5):874-877

Department of Biology, University of Maryland, College Park MD 20742, USA.

The auditory brainstem response (ABR) is generated in the auditory brainstem by local current sources, which also give rise to extracellular field potentials (EFPs). The origins of both the ABR and the EFP are not well understood. We have recently found that EFPs, especially their dipole behavior, may be dominated by the branching patterns and the activity of axonal terminal zones [1]. Read More

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Over-representation of speech in older adults originates from early response in higher order auditory cortex.

Acta Acust United Acust 2018 Sep-Oct;104(5):774-777

Institute for Systems Research, University of Maryland, College Park, Maryland.

Previous research has found that, paradoxically, while older adults have more difficulty comprehending speech in challenging circumstances than younger adults, their brain responses track the envelope of the acoustic signal more robustly. Here we investigate this puzzle by using magnetoencephalography (MEG) source localization to determine the anatomical origin of this difference. Our results indicate that this robust tracking in older adults does not arise merely from having the same responses as younger adults but with larger amplitudes; instead, they recruit additional regions, inferior to core auditory cortex, with a short latency of ~30 ms relative to the acoustic signal. Read More

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January 2019

Pitch of Harmonic Complex Tones: Rate Coding of Envelope Repetition Rate in the Auditory Midbrain.

Acta Acust United Acust 2018 Sep-Oct;104(5):860-864

Eaton-Peabody Labs, Massachusetts Eye & Ear, Boston, MA, USA.

Envelope repetition rate (ERR) is an important cue for the pitch of harmonic complex tones (HCT), especially when the tone consists entirely of unresolved harmonics. Neural synchronization to the stimulus envelope provides a prominent cue for ERR in the auditory periphery, but this temporal code becomes degraded and gives way to rate codes in higher centers. The inferior colliculus (IC) likely plays a key role in this temporal-to-rate code transformation. Read More

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January 2019

Revisiting Models of Concurrent Vowel Identification: The Critical Case of No Pitch Differences.

Acta Acust United Acust 2018 Sep-Oct;104(5):922-925

Medical Research Council Institute of Hearing Research, University of Nottingham, NG7 2RD, UK.

When presented with two vowels simultaneously, humans are often able to identify the constituent vowels. Computational models exist that simulate this ability, however they predict listener confusions poorly, particularly in the case where the two vowels have the same fundamental frequency. Presented here is a model that is uniquely able to predict the combined representation of concurrent vowels. Read More

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October 2018

Predicting Speech Intelligibility Based on Across-Frequency Contrast in Simulated Auditory-Nerve Fluctuations.

Acta Acust United Acust 2018 Sep-Oct;104(5):914-917

Hearing Systems group, Department of Electrical Engineering, Technical University of Denmark, 2800 Kgs.Lyngby.

The present study proposes a modeling approach for predicting speech intelligibility for normal-hearing (NH) and hearing-impaired (HI) listeners in conditions of stationary and fluctuating interferers. The model combines a non-linear model of the auditory periphery with a decision process that is based on the contrast across characteristic frequency (CF) after modulation analysis in the range of the fundamental frequency of speech. Specifically the short-term across-CF correlation between noisy speech and noise alone is assumed to be inversely related to speech intelligibility. Read More

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December 2020

Challenging One Model With Many Stimuli: Simulating Responses in the Inferior Colliculus.

Acta Acust United Acust 2018 Sep-Oct;104(5):895-899

Department of Biomedical Engineering, University of Rochester, New York, USA.

Existing models to explain human psychophysics or neural responses are typically designed for a specific stimulus type and often fail for other stimuli. The ultimate goal for a neural model is to simulate responses to many stimuli, which may provide better insights into neural mechanisms. We tested the ability of modified same-frequency inhibition-excitation models for inferior colliculus neurons to simulate individual neuron responses to both amplitude-modulated sounds and tone-in-noise stimuli. Read More

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December 2020

Evidence for Gain Reduction by a Precursor in an On-Frequency Forward Masking Paradigm.

Acta Acust United Acust 2018 Sep-Oct;104(5):809-812

Department of Speech, Language, and Hearing Sciences, Purdue Univ, West Lafayette, Indiana, United States.

A forward masking technique was used to measure cochlear gain reduction which might be consistent with the medial olivocochlear reflex (MOCR). A 4-kHz signal was set at 20 dB SL, and an on-frequency forward masker adjusted to just mask the signal. Adding a pink noise precursor before the signal and masker the level of the masker needed to mask the signal, in contrast to what would be expected from theories such as additivity of masking. Read More

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November 2019

Effects of hearing loss on maintaining and switching attention.

Acta Acust United Acust 2018 1;104(5):787-791. Epub 2018 Sep 1.

Department of Speech and Hearing Sciences, University of Washington, Seattle, WA 98195, USA.

The ability to intentionally control attention based on task goals and stimulus properties is critical to communication in many environments. However, when a person has a damaged auditory system, such as with hearing loss, perceptual organization may also be impaired, making it more difficult to direct attention to different auditory objects in the environment. Here we examined the behavioral cost associated with maintaining and switching attention in people with hearing loss compared to the normal hearing population, and found a cost associated with attending to a target stream in a multi-talker environment that cannot solely be attributed to audibility issues. Read More

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September 2018

Evaluation of the starting point of the Lombard Effect.

Acta Acust United Acust 2017 Jan-Feb;103(1):169-172. Epub 2017 Jan 1.

Voice Biomechanics and Acoustics Laboratory, Department of Communicative Sciences and Disorders, Michigan State University, East Lansing, Michigan, United States of America.

Speakers increase their vocal effort when their communication is disturbed by noise. This adaptation is termed the Lombard effect. The aim of the present study was to determine whether this effect has a starting point. Read More

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January 2017

Impact of Vocal Tract Resonance on the Perception of Voice Quality Changes Caused by Varying Vocal Fold Stiffness.

Acta Acust United Acust 2016 Mar-Apr;102(2):209-213

UCLA School of Medicine, Head and Neck Surgery Dept., 1000 Veteran Ave, 31-24 Rehab Center, Los Angeles, CA 90095, USA.

Experiments using animal and human larynx models are often conducted without a vocal tract. While it is often assumed that the absence of a vocal tract has only small effects on vocal fold vibration, it is not actually known how sound production and quality are affected. In this study, the validity of using data obtained in the absence of a vocal tract for voice perception studies was investigated. Read More

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Reliability in Measuring Head Related Transfer Functions of Hearing Aids.

Acta Acust United Acust 2015 Sep;101(5):1064-1066

Acoustics Research Institute, Austrian Academy of Sciences, Vienna, Austria.

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September 2015

Experimental and Theoretical Investigations of Phonation Threshold Pressure as a Function of Vocal Fold Elongation.

Acta Acust United Acust 2011 Jul;97(4):669-677

Department of Surgery, Division of Otolaryngology - Head and Neck Surgery, University of Wisconsin, School of Medicine and Public Health, Madison, WI53792-7375, USA.

The relationship between the vocal fold elongation and the phonation threshold pressure (PTP) was experimentally and theoretically investigated. The PTP values of seventeen excised canine larynges with 0% to 15% bilateral vocal fold elongations in 5% elongation steps were measured using an excised larynx phonation system. It was found that twelve larynges exhibited a monotonic relationship between PTP and elongation; in these larynges, the 0% elongation condition had the lowest PTP. Read More

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Towards a self-rating tool of the inability to produce soft voice based on nonlinear events: a preliminary study.

Acta Acust United Acust 2011 May-Jun;97(3):373-381. Epub 2011 May 1.

National Center for Voice and Speech, The University of Utah, Salt Lake City, UT.

The purpose of this preliminary study was to investigate the feasibility of a tool to compare a severity index of nonlinear events and vocal self-rating over a long period of time. One hundred and ninety-seven phonations were analyzed to quantify the severity of instabilities in the voice attributed to nonlinear dynamic phenomena, including voice breaks, subharmonics, and frequency jumps. Instabilities were first counted; then a severity index was calculated for the instabilities in each phonation. Read More

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