Contextual Lateralization Based on Interaural Level Differences Is Preshaped by the Auditory Periphery and Predominantly Immune Against Sequential Segregation.
Bernhard Laback
PMID 37161352WHAT IT FOUND
A preceding sound biases the perceived location of the next sound.
This shift persists even when the two sounds have different pitches. The effect is driven by early auditory processing in the inner ear rather than higher-level attention or grouping.
Key findings
01A preceding sound (precursor) systematically shifts the perceived azimuth of a subsequent target sound away from the precursor's location.
02This spatial bias remains robust even when a salient pitch cue is introduced to help listeners perceptually separate the two sounds.
03Computational modeling suggests that peripheral mechanisms, specifically auditory nerve adaptation and medial olivocochlear (MOC) reflex feedback, significantly contribute to this localization bias.
STILL TO COME
How it was doneWhat they found
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What it does not show
The study included only five participants per experiment, limiting the generalizability of the findings to the broader population. The stimuli were narrowband noise bursts, which may not fully represent the complex spectral dynamics of real-world speech or environmental sounds. The modeling relied on specific parameters for the auditory periphery that are derived from animal data (cats), which may not perfectly translate to human auditory processing.
Declared interests
The author declared no potential conflicts of interest. The work was supported by the Open Access Fund of the ÖAW.
The easy way to misread this
Do not assume that helping patients distinguish between sequential sounds (e.g., through pitch or timbre differences) will eliminate localization biases. The study found that these spatial shifts are driven by early, automatic peripheral mechanisms and are largely immune to higher-level perceptual segregation cues.