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Quality and Usability LabStefan Uhrig

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Stefan Uhrig

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Biography

Stefan received M.Sc. degrees in Psychology at the University of Giessen (2013) and in Human Factors at the Technical University of Berlin (2016). Since February 2017, he is working as a scholarship PhD student at the Quality and Usability Lab.

Research Topics

► Perceived quality (with focus on transmitted speech)

► Psychophysiology (electroencephalography, EEG)

► Data analysis and statistics

Current Project

Physiological correlates of perceived quality, presence and immersion in virtual environments (part of joint PhD program between TU Berlin, Germany, and NTNU Trondheim, Norway)

Contact

Address

Quality and Usability Lab
Deutsche Telekom Laboratories
Technische Universität Berlin
Ernst-Reuter-Platz 7
D-10587 Berlin, Germany

Publications

Neural correlates of speech quality dimensions analyzed using electroencephalography (EEG)
Zitatschlüssel uhrig2019a
Autor Uhrig, Stefan and Mittag, Gabriel and Möller, Sebastian and Voigt-Antons, Jan-Niklas
Seiten 036009
Jahr 2019
ISSN 1741-2552
DOI 10.1088/1741-2552/aaf122
Journal Journal of Neural Engineering
Jahrgang 16
Nummer 3
Monat mar
Notiz electronic, online
Verlag IOP Publishing
Wie herausgegeben Fullpaper
Zusammenfassung Objective. By means of subjective psychophysical methods, quality of transmitted speech has been decomposed into three perceptual dimensions named ‚discontinuity‚ (F), ‚noisiness‚ (N) and ‚coloration‚ (C). Previous studies using electroencephalography (EEG) already reported effects of perceived intensity of single quality dimensions on electrical brain activity. However, it has not been investigated so far, whether the dimensions themselves are dissociable on a neurophysiological level of analysis. Approach. Pursuing this goal in the present study, a high-quality (HQ) recording of a spoken word was degraded on each dimension at a time, resulting in three quality-impaired stimuli (F, N, C) which were on average described as being equal in perceived degradation intensity. Participants performed a three-stimulus oddball task, involving the serial presentation of different stimulus types: (1) HQ or degraded ‚standard‚ stimuli to establish sensory/perceptual quality references. (2) Degraded ‚oddball‚ stimuli to cause random, infrequent deviations from those references. EEG was employed to examine the neuro-electrical correlates of speech quality perception. Main results. Emphasis was placed on modulations in temporal and morphological characteristics of the P300 component of the event-related brain potential (ERP), whose subcomponents P3a and P3b are commonly linked to attentional orienting and task relevance categorization, respectively. Electrophysiological data analysis revealed significant modulations of P300 amplitude and latency by the perceptual dimensions underlying both quality references and oddball stimuli. Significance. The present study exemplifies the utility of physiological methods like EEG for dissociating speech degradations not only based on perceived intensity level, but also their distinctive quality dimension.
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