Dresden 2006 – scientific programme

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DY: Dynamik und Statistische Physik

DY 46: Poster

DY 46.82: Poster

Thursday, March 30, 2006, 16:00–18:00, P1

Signal Detection in Comodulated Noise — •Michael Buschermöhle, Ulrike Feudel, Jesko L. Verhey, and Jan A. Freund — Carl-von-Ossietzky Universität Oldenburg

Many natural sounds share the property of having common amplitude modulations across different frequency regions. Examples of these kinds of sounds are the masking noises used for experiments concerning comodulation detection differences (CDD) and comodulation masking release (CMR). Typical stimuli for these experiments consist of one or more masking noise bands and a signal that is either a pure tone or a noise band as well. Previous research in humans and other vertebrates has shown that in CDD and CMR experiments signal detection thresholds vary depending on the correlation structure of the envelopes of the constituting noise bands. We propose a simple model that is capable of reproducing important features of psychophysical signal detection thresholds in response to CDD and CMR stimuli. The model is based solely on peripheral processing and has the following stages: frequency filtering, envelope extraction, compression, and computation of the temporal average. Signal detection is realized by registering changes in the mean compressed envelope of the filtered stimulus. Many aspects of CMR and CDD can be accounted for by this largely analytically tractable model.