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A Method to Study Adaptation to Left-Right Reversed Audition

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Published on: October 29, 2018

Response organization in selective adaptation to speech sounds.

James R Sawusch¹, David B Pisoni¹

¹Indiana University, Bloomington, Indiana 47401.

Perception & Psychophysics

|January 21, 2014

Summary

Selective adaptation in speech perception is influenced by acoustic stimulus properties, not just labeling instructions. This challenges feature detector models and highlights the role of perceived sound in auditory adaptation.

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Area of Science:

Psychology
Linguistics
Auditory Neuroscience

Background:

Selective adaptation in speech perception shifts category boundaries toward adapting stimuli.
Feature detector models propose reduced sensitivity explains these shifts.

Purpose of the Study:

Investigate if labeling instructions, rather than acoustic properties, drive adaptation effects.
Examine the role of response organization in selective adaptation experiments.

Main Methods:

Used a perceptually ambiguous speech stimulus ([bi]-[di] continuum) as an adaptor.
Two subject groups received different labeling instructions for the same acoustic stimulus.

Main Results:

The ambiguous adaptor did not shift the category boundary as predicted by labeling.
Adaptation effects were determined by the acoustic stimulus, not the provided label.

Conclusions:

Acoustic attributes and perceived quality of speech stimuli are primary drivers of adaptation.
Labeling instructions do not override the influence of acoustic properties in speech adaptation.