No spatial release from amplitude modulation masking

Authors

  • Eric R. Thompson Centre for Applied Hearing Research, Technical University of Denmark, DK-2800 Lyngby, Denmark; Hearing Research Center, Boston University, Boston, MA 02215, USA
  • Torsten Dau Centre for Applied Hearing Research, Technical University of Denmark, DK-2800 Lyngby, Denmark
  • Barbara G. Shinn-Cunningham Hearing Research Center, Boston University, Boston, MA 02215, USA

Abstract

In many signal detection and speech intelligibility studies, performance is improved if there is a perceived spatial separation between the target and the masker, as compared to when the target and masker are perceived to be co-located. The goal of the present study was to determine if a similar spatial release from masking can be measured in a masked amplitude modulation (AM) detection experiment. Temporally interleaved transposed stimuli were used as AM carriers for the experiments. These carriers could be lateralized separately using only interaural time differences (ITDs) and not interaural level differences (ILDs). The rst experiment measured the perceived lateral positions of the probe and masker, independently and in combination. Experiment two used the same stimuli as carriers for measuring masked modulation detection thresholds. The results showed that the probe and masker could be perceived to come from separate lateral positions. The modulation detection results showed bandpass modulation-frequency tuning. There was no improvement in modulation thresholds when the target was diotic and the masker was lateralized with a 1-ms ITD, as compared to the co-located condition.

References

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Additional Files

Published

2009-12-15

How to Cite

Thompson, E. R., Dau, T., & Shinn-Cunningham, B. G. (2009). No spatial release from amplitude modulation masking. Proceedings of the International Symposium on Auditory and Audiological Research, 2, 191–202. Retrieved from https://proceedings.isaar.eu/index.php/isaarproc/article/view/2009-20

Issue

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

Section

2009/2. Perceptual measures and models of spatial hearing

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