Tid: Torsdag 20 april 2017, 13:00-15:00
Plats: Övningslabbet (Fonetiklaboratoriet, plan 2 i hus C), Södra huset, Frescati

Abstract

Most studies of speech coding in the auditory nervous system have focused on how the spectrum of speech sounds is coded in the responses of auditory-nerve fibers. The limited dynamic range of auditory-nerve discharge rates poses a challenge for coding of the sound spectrum, motivating the investigation of temporal aspects of the neural responses. These investigations have mainly focused on the detailed “fine structure” of phase-locked responses; however, temporal fine-structure information is lost along the ascending auditory pathway. We will instead focus on the neural representation of lower-frequency fluctuations, related to F0 and spectra slopes (for unvoiced sounds.) Neurons in the auditory midbrain are very sensitive to fluctuations in the frequency range of voice pitch, setting up a robust representation for speech sounds, in quiet and in noisy backgrounds. Consideration of the response properties of these midbrain neurons, from a vantage point higher on the ascending auditory pathway, provides new insight into the neural representations of speech and the patterns that are provided as inputs to the forebrain.

Om föreläsaren:
Laurel H. Carney, PhD
Professor of Biomedical Engineering
University of Rochester
Laurel Carney ic currently Visiting Professor at Hearing Systems, Electrical Engineering, Danish Technical University, and Fellow at Hanse-Wissenschaftskolleg Institute for Advanced Study, Germany.

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