Comparison of decision criteria for interaural correlation discrimination

Authors

  • Helge Lüddemann Medizinische Physik, Fakultät V, Institut für Physik, Carl von OssietzkyUniversität Oldenburg, D-26111 Oldenburg, Germany
  • Helmut Riedel Medizinische Physik, Fakultät V, Institut für Physik, Carl von OssietzkyUniversität Oldenburg, D-26111 Oldenburg, Germany
  • Birger Kollmeier Medizinische Physik, Fakultät V, Institut für Physik, Carl von OssietzkyUniversität Oldenburg, D-26111 Oldenburg, Germany

Abstract

This contribution presents psychometric functions for interaural correlation (IAC) discriminability with respect to nine reference correlations (+1, 0, –1 and six intermediate values), measured in a novel 2-pair-2-AFC paradigm. Data were analyzed in various ways, to demonstrate that the normalized cross correlation coef cient (ρ) is generally inadequate for a description of psychoacoustical data by means of normal signal detection theory (SDT). Besides this rather destructive outcome, a Thurstone model case V [Thurstone, Psychol. Rev. 34, 273-286 (1927)] was tted to the joint set of data from all pairwise comparisons, to determine a decision variable which is fully compatible with equal variance Gaussian SDT (allows for prediction of discrimination rates and thresholds independent of the reference correlation). The optimal decision variable is well approximated by the dB-scaled ratio of energies in the correlated (N0) and anticorrelated (Nπ) signal components, but only if the effects of a noisy periphery are considered.

References

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Additional Files

Published

2009-12-15

How to Cite

Lüddemann, H., Riedel, H., & Kollmeier, B. (2009). Comparison of decision criteria for interaural correlation discrimination. Proceedings of the International Symposium on Auditory and Audiological Research, 2, 181–190. Retrieved from https://proceedings.isaar.eu/index.php/isaarproc/article/view/2009-19

Issue

Vol. 2 (2009): Binaural Processing and Spatial Hearing

Section

2009/2. Perceptual measures and models of spatial hearing

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