Binaural-cue reweighting induced by discrimination training
Maike Klingel1,2, Udbhav Singhal2,3, Aaron R Seitz3
1Acoustics Research Institute, Austrian Academy of Sciences, Vienna, Austria.
Attention, Perception & Psychophysics
|May 14, 2025
Summary
This study developed a new auditory-only training method to adjust how listeners weigh sound localization cues. The training successfully reweighted interaural time differences (ITDs) and interaural level differences (ILDs) in participants.
Area of Science:
- Auditory Neuroscience
- Psychoacoustics
- Human Perception
Background:
- Sound localization relies on binaural cues: interaural time difference (ITD) and interaural level difference (ILD).
- Cue weighting is frequency-dependent but adaptable based on environmental factors or training.
- Improving spatial hearing in diverse populations may benefit from manipulating cue weighting.
Purpose of the Study:
- To introduce and evaluate a novel, auditory-only training procedure for modifying the relative weighting of ITD and ILD cues.
- To determine if this training method can effectively induce changes in cue weighting.
- To assess the accessibility and individualizability of the proposed training approach.
Main Methods:
- An experiment involved pretest, three training sessions, and posttest with participants divided into ITD-reinforced, ILD-reinforced, and control groups.
- Training utilized an adaptive staircase of auditory-only discrimination trials with narrow-band noise bursts (2-4 kHz).
- Participants performed a localization task, receiving feedback to imagine sound movement in the trained cue's direction.
Main Results:
- Both ITD and ILD training groups showed a significant increase in the weight of the reinforced cue.
- This cue reweighting effect persisted throughout the training sessions.
- No significant changes in cue weighting were observed in the control group.
Conclusions:
- The developed auditory-only training method is effective for reweighting both ITD and ILD cues.
- The training is individualized and accessible due to its reliance on simple auditory tasks and minimal equipment.
- This approach holds potential for enhancing spatial hearing across various listener populations.
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