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Updated: Jul 2, 2026
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A Two-interval Forced-choice Task for Multisensory Comparisons
Published on: November 9, 2018
Probing the Underlying Mechanisms of Spectro-Temporal Modulation Discrimination
Lily Cassandra Paulick1, David López-Ramos2, Léo Varnet3
1Hearing Systems, Department of Health Technology, Technical University of Denmark, Kongens Lyngby, Denmark.
Trends in Hearing
|July 1, 2026
Summary
Listeners primarily focus on upward spectro-temporal modulations (STMs) when discriminating sound direction, with downward surrounds hindering perception. Individual differences in STM processing remain significant.
Area of Science:
- Auditory Neuroscience
- Psychoacoustics
Background:
- Speech perception heavily depends on processing spectro-temporal modulations (STMs).
- Mechanisms of STM perception and individual variability are not fully understood.
Purpose of the Study:
- Investigate STM discrimination mechanisms using a reverse-correlation paradigm.
- Examine how listeners differentiate upward and downward STMs under varying surround conditions.
Main Methods:
- Employed a reverse-correlation task with normal-hearing participants.
- Tested three surround conditions: none, upward STM surround, and downward STM surround.
- Derived perceptual kernels from stimuli perturbed with spectro-temporal noise.
Main Results:
- Listeners predominantly weighted upward-moving targets, with limited simultaneous monitoring of both directions.
- Sensitivity decreased in the downward-moving surround condition, indicating orientation-specific interference.
- Model simulations and behavioral data supported reliance on upward-target templates and phase sensitivity.
Conclusions:
- Listeners show a bias towards upward-moving STMs, and downward surrounds interfere with discrimination.
- Individual perceptual kernels exhibit variability not fully explained by current models.
- Reverse-correlation is valuable for evaluating auditory models and perceptual strategies.
