Stephan Ernst

University of Würzburg

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Birger Kollmeier

Carl von Ossietzky Universität Oldenburg

Jesko L. Verhey

Otto-von-Guericke University Magdeburg

Martin Walger

University Hospital Cologne

Horst Hessel

Cochlear (Australia)

Florian Denk

Karlsruhe Institute of Technology

Christoph Völker

Federal Institute For Materials Research and Testing

Hasso von Wedel

University of Cologne

Astrid Foerst

University of Cologne

Stefan Uppenkamp

Carl von Ossietzky Universität Oldenburg

Giso Grimm

Hearing4all

Cooperative Institutions

University of Cologne

Carl von Ossietzky Universität Oldenburg

Hearing4all

University Hospital Cologne

Klinik und Poliklinik für Hals-, Nasen-, Ohrenheilkunde

University of Würzburg

Klinikum Oldenburg

Google (United States)

Klinik und Poliklinik für Psychosomatik und Psychotherapie

Fraunhofer Institute for Digital Media Technology

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Comodulation masking release and its representation in human auditory cortex

The Journal of the Acoustical Society of America (2008)

Stephan Ernst Jesko L. Verhey Stefan Uppenkamp

The aim of the present study was to find a correlate of the psychoacoustical effect of comodulation masking release (CMR) in human auditory cortex using functional magnetic resonance imaging (fMRI). The target stimulus was a sinusoidal signal embedded in a band limited white noise which was either unmodulated or multiplied with an irregular square-wave modulator with mean modulation frequency of 40 Hz (comodulated condition). For all listeners participating in the fMRI study, the average psychoacoustic threshold difference between the unmodulated and the comodulated condition (i.e., the CMR) was 20 dB. Similar to the results from a previous fMRI study on pure-tone masking (Ernst, Verhey, Uppenkamp, ARO abstracts 30 (2007), p. 302(A)), a spatial dissociation of changes of overall level and signal-to-noise ratio in auditory cortex was found. The comparison of the fMRI activation maps for a signal presented in modulated and in unmodulated noise reveals that those regions in the antero-lateral part of Heschl's gyrus previously shown to represent the audibility of a target (rather than overall level) exhibit a stronger activation for the modulated than for the unmodulated conditions. This result is interpreted as a physiological correlate of the psychoacoustical CMR effect at the level of the auditory cortex.

Gyrus

Stimulus (psychology)

Psychoacoustics

Critical band

10.1121/1.2935708

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Citations (1)

Einfluß monauraler Deprivation auf die Reifung der Hörbahn bei der mongolischen Wüstenrennmaus (Meriones unguiculatus)

HNO (2000)

Stephan Ernst Astrid Foerst Horst Hessel Heinz Dieter Klünter Hasso von Wedel

10.1007/s001060050032

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Citations (3)

Comparing Binaural Pre-processing Strategies I

Trends in Hearing (2015)

Regina M. Baumgärtel Martin Krawczyk-Becker Daniel Marquardt Christoph Völker Hongmei Hu

In a collaborative research project, several monaural and binaural noise reduction algorithms have been comprehensively evaluated. In this article, eight selected noise reduction algorithms were assessed using instrumental measures, with a focus on the instrumental evaluation of speech intelligibility. Four distinct, reverberant scenarios were created to reflect everyday listening situations: a stationary speech-shaped noise, a multitalker babble noise, a single interfering talker, and a realistic cafeteria noise. Three instrumental measures were employed to assess predicted speech intelligibility and predicted sound quality: the intelligibility-weighted signal-to-noise ratio, the short-time objective intelligibility measure, and the perceptual evaluation of speech quality. The results show substantial improvements in predicted speech intelligibility as well as sound quality for the proposed algorithms. The evaluated coherence-based noise reduction algorithm was able to provide improvements in predicted audio signal quality. For the tested single-channel noise reduction algorithm, improvements in intelligibility-weighted signal-to-noise ratio were observed in all but the nonstationary cafeteria ambient noise scenario. Binaural minimum variance distortionless response beamforming algorithms performed particularly well in all noise scenarios.

Intelligibility (philosophy)

Sound Quality

Monaural

10.1177/2331216515617916

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Citations (42)

Komplikationen der CT-gesteuerten lumbalen Sympathikolyse: Eigene Erfahrungen und Literaturübersicht

RöFo - Fortschritte auf dem Gebiet der Röntgenstrahlen und der bildgebenden Verfahren (1998)

Stephan Ernst Walter Heindel Roman Fischbach M. Gawenda H.-J. Langen

Ziel der Arbeit ist, anhand eigener Erfahrungen und einer Literaturzusammenstellung eine aktuelle Übersicht über Komplikationsmöglichlceiten der CT-gesteuerten lumbalen Sympathikolyse (CTLS) zu geben. Methode: Es wurden 241 CT-gesteuerte lumbale Sympathikolysen in standardisierter, nach Haaga modifizierter Technik durchgeführt. Die im Rahmen der klinischen Nachbeobachtung bekannt gewordenen 4 schweren Komplikationen wurden analysiert und den Ergebnissen einer Literaturrecherche gegenübergestellt. Ergebnisse: Bei den eigenen Patienten wurden drei narbige Ureterstenosen und ein retroperitonealer Abszeß bekannt. Die tabellarische Zusammenfassung der in der Literatur beschriebenen schweren Nebenwirkungen der CTLS verdeutlicht, daß durch die methodische Weiterentwicklung vom chirurgischen Eingriff über die „blinde” und die durchleuchtungsgezielte Punktion bis hin zum CT-gesteuerten Verfahren die Schwere und Häufigkeit der Komplikationen reduziert werden konnten. Seit Etablierung der CTLS ist in der Literatur über keinen interventionsbedingten Todesfall mehr berichtet worden. Die Ergebnisse legen nahe, daß abhängig von der individuellen Verteilung des Neurolytikums auch chemische Ureterschädigungen möglich sind. Schlußfolgerung: Bei Einhaltung bestimmter Verhaltensregeln ist die CTLS ein sehr sicheres Therapieverfahren. Da eine Ureterschädigung auch bei technisch einwandfreier Durchführung auftreten kann, ist eine systematische sonographische Kontrolluntersuchung nach drei Monaten zu empfehlen.

Neurolysis

Impaction

10.1055/s-2007-1015185

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Citations (16)

Abelard, Peter

Springer eBooks (2023)

Stephan Ernst

10.1007/978-94-007-6519-1_580

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Measuring hearing instrument sound modification using integrated ear-EEG

Proceedings of the International Symposium on Auditory and Audiological Research (2017)

Florian Denk Marleen Grzybowski Stephan Ernst Birger Kollmeier Stefan Debener

We integrated ear electrodes into a live hearing system and evaluated the feasibility of recording electroencephalography (EEG) features with this setup using an auditory discrimination experiment. The long-term goal is to construct a closed-loop brain-computer-interface that is integrated in a mobile research hearing system. Here, the EEG setup consists of 3 electrodes embedded in the earmoulds of an experimental hearing system and 10 flex-printed electrodes positioned around each ear, all connected to a wireless EEG amplifier. Four consecutive identical broadband stimuli were played in headphones while the spectral profile of sounds arriving at the eardrum was altered by switching the signal processing setting of the hearing system. Such switches were made between presentation of the third and the fourth stimulus, in half of all epochs. Seventeen normal hearing subjects participated and were instructed to indicate whether the last stimulus sounded different. The behavioural data verified clear audibility of the switches. The EEG analysis revealed differences between switch and no-switch trials in the N1 and P3 latency range. Importantly, changes in the spectral content of the noise floor of the hearing device were already sufficient to elicit these responses. These results confirm that stimulus-related brain signals acquired from ear-EEG during real-time audio processing can be successfully derived.

Headphones

Stimulus (psychology)

Hearing aid

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Citations (2)

Matthias Bender: Verhältnismäßigkeit in der modernen Medizin. Von den außergewöhnlichen Mitteln zur Behandlungsqualität als personaler Abwägung (Erfurter theologische Studien, Bd. 109), Würzburg: Echter 2016

Münchener Theologische Zeitschrift (2018)

Stephan Ernst

10.5282/mthz/5182

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Ius canonicum in communione christifidelium

Brill | Schöningh eBooks (2016)

Stephan Haering OSB Barbara Schmitz Stephan Ernst Helmuth Pree Ansgar Hense

Die Frage des Verhältnisses von II. Vatikanischem Konzil und dem geltenden Kirchenrecht und damit verbunden die Frage nach der Rezeption des II. Vatikanischen Konzils in der geltenden Rechtsordnung, das Verhältnis von Staat und Religion in der Bundesrepublik Deutschland und ihr Religionsrecht sowie weitere theologische Brückenschläge von und zum Kirchenrecht stehen im Zentrum dieses Bandes. Diese Themen zeichnen auch die entscheidenden Weglinien der kirchen- und religionsrechtlichen Forschung von Heribert Hal-lermann nach. Dieser Band ehrt daher den Würzburger Kirchenrechtler zu seinem 65. Geburtstag und hebt in sei-nem Titel das Hauptanliegen seiner Forschung und seiner Lehre hervor, das Kirchenrecht als hilfreiches pastorales In-strument innerhalb des Volkes Gottes auszuweisen.

10.30965/9783657785650

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Die Natur vollständig aufgegeben?: Stellungnahme zu Michael Rosenbergers Artikel "Ein Du vom ersten Moment"

Stimmen der Zeit <Freiburg, Breisgau> (2005)

Stephan Ernst

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Mechanisms underlying the detection of frequency modulation

The Journal of the Acoustical Society of America (2010)

Stephan Ernst Brian C. J. Moore

Frequency modulation detection limens (FMDLs) were measured for carrier frequencies (fc) of 1000, 4000, and 6000 Hz, using modulation frequencies (fm) of 2 and 10 Hz and levels of 20 and 60 dB sensation level (SL), both with and without random amplitude modulation (AM), applied in all intervals of a forced-choice trial. The AM was intended to disrupt excitation-pattern cues. At 60 dB SL, the deleterious effect of the AM was smaller for fm = 2 than for fm = 10 Hz for fc = 1000 and 4000 Hz, respectively, while for fc = 6000 Hz the deleterious effect was large and similar for the two values of fm. This is consistent with the idea that, for fc below about 5000 Hz and fm = 2 Hz, frequency modulation can be detected via changes in phase locking over time. However, at 20 dB SL, the deleterious effect of the added AM for fc = 1000 and 4000 Hz was similar for the two values of fm, while for fc = 6000 Hz, the deleterious effect of the AM was greater for fm = 10 than for fm = 2 Hz. It is suggested that, at low SLs, the auditory filters become relatively sharp and phase locking weakens, so that excitation-pattern cues influence FMDLs even for low fc and low fm.

Modulation (music)

Frequency deviation

10.1121/1.3506350

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Citations (28)