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Updated: Mar 19, 2026
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A Method to Study Adaptation to Left-Right Reversed Audition
Published on: October 29, 2018
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Neural correlates of auditory scale illusion
Shinya Kuriki1, Ryousuke Numao2, Iku Nemoto2
1Research Center for Science and Technology, Tokyo Denki University, Inzai, Chiba, Japan.
Hearing Research
|June 14, 2016
Summary
The brain
Area of Science:
- Auditory neuroscience
- Cognitive neuroscience
- Neuroimaging
Background:
- The auditory scale illusion involves dichotic presentation of tones, creating perceived smooth pitch streams.
- Previous studies focused on behavior, leaving the neural basis of this illusion unclear.
Purpose of the Study:
- To investigate the neural mechanisms underlying the auditory scale illusion using functional magnetic resonance imaging (fMRI).
- To identify brain regions involved in processing illusory auditory percepts and the influence of tone presentation rate.
Main Methods:
- fMRI was used to compare brain activation between stimuli inducing the scale illusion (ILL) and those mimicking the percept (PCP).
- Region-of-interest analysis was performed, considering the effects of auditory adaptation at various tempi (83, 126, and 245 bpm).
Main Results:
- Auditory adaptation did not explain the observed activation differences in the superior temporal auditory cortex.
- Increased activation for ILL vs. PCP stimuli was found in the posterior auditory cortex (rightward dominant) at moderate tempi.
- Prefrontal cortex activation was dominant at the highest tempo.
Conclusions:
- The posterior planum temporale is implicated in the formation of the auditory scale illusion.
- The neural processing of this auditory illusion is significantly influenced by the rate of tone presentation.
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