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Brain Hemispheres Swap Dominance for Processing Semantically Meaningful Pitch
Xiao-Dong Wang1,2, Hong Xu3, Zhen Yuan4
1Faculty of Psychology, Southwest University, Chongqing, China.
Frontiers in Human Neuroscience
|February 22, 2021
Summary
Brain hemisphere dominance for auditory processing shifts. Early auditory processing shows right hemisphere dominance, while later semantic interpretation reveals left hemisphere dominance for Chinese lexical tones.
Area of Science:
- Neuroscience
- Cognitive Science
- Auditory Neuroscience
Background:
- Brain laterality in auditory cognitive processing remains unclear.
- Hemisphere dominance for processing complex auditory information is not fully understood.
Purpose of the Study:
- To investigate the dynamic changes in brain hemisphere dominance during auditory processing.
- To determine how acoustic and semantic features influence auditory laterality.
Main Methods:
- Simultaneous recording of mismatch negativity (MMN) and behavioral reaction time during dichotic listening.
- Utilizing Chinese lexical tones and meaningless pure tones as auditory stimuli.
- Comparing brain responses and reaction times between early and late auditory processing stages.
Main Results:
- Mismatch negativity (MMN) indicated right hemisphere dominance for early auditory processing.
- Behavioral reaction time showed a right ear advantage (left hemisphere dominance) for semantic interpretation of lexical tones.
- This hemisphere dominance swap was specific to meaningful lexical tones, not pure tones.
Conclusions:
- Hemisphere dominance in auditory processing is not fixed but dynamically shifts based on the input's acoustic and functional properties.
- Auditory processing involves a labor division between hemispheres, initially based on acoustic cues and subsequently on functional/semantic cues.
- This finding provides new insights into the neural mechanisms underlying speech and language processing.
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