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Functional Connectivity in the Left Dorsal Stream Facilitates Simultaneous Language Translation: An EEG Study
1Auditory Research Group Zurich (ARGZ), Division Neuropsychology, Institute of Psychology, University of Zurich Zurich, Switzerland.
Simultaneous interpreters show stronger brain connectivity in the dorsal speech pathway, suggesting enhanced sound-to-articulation mapping. This neural adaptation is linked to training duration and early language learning, highlighting the brain's plasticity.
Area of Science:
- Neuroscience
- Cognitive Science
- Linguistics
Background:
- Cortical speech processing involves ventral (sound-to-meaning) and dorsal (sound-to-articulation) streams.
- Simultaneous interpreters (SIs) possess unique language processing adaptations due to extensive training.
Purpose of the Study:
- To compare functional connectivity in the dorsal stream between SIs and multilingual controls.
- To investigate the neural basis of enhanced speech processing in SIs.
Main Methods:
- EEG was used to measure intracranial functional connectivity between the auditory-related cortex (ARC) and Broca's region.
- Participants performed auditory semantic decision tasks under mixed and unmixed conditions.
Main Results:
- SIs exhibited increased left-hemispheric theta phase synchronization compared to controls.
- Dorsal pathway connectivity in SIs correlated positively with training hours and inversely with age of training commencement.
Conclusions:
- SIs more strongly recruit the dorsal pathway, potentially pre-activating speech codes.
- Neuronal oscillation alignment in SIs reflects training, sensitive periods, and predisposition.
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