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Related Experiment Videos

Left putaminal activation when speaking a second language: evidence from PET

D Klein1, R J Zatorre, B Milner

  • 1Neuropsychology/Cognitive Neuroscience Unit, Montreal Neurological Institute (MNI), McGill University, Quebec, Canada.

Neuroreport
|November 21, 1994
PubMed
Summary

Bilingual brain imaging reveals that speaking a second language (L2) uniquely activates the left putamen. This suggests the putamen plays a key role in the complex motor control required for L2 articulation.

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Area of Science:

  • Neuroscience
  • Psycholinguistics
  • Cognitive Science

Background:

  • The neural basis of bilingual language processing remains a significant area of research and debate.
  • Understanding how the brain represents and produces multiple languages is crucial for cognitive neuroscience.

Purpose of the Study:

  • To investigate whether producing a second language (L2) engages the same neural areas as producing a first language (L1).
  • To identify specific brain regions involved in the neural representation of L2 production in bilingual individuals.

Main Methods:

  • Utilized positron emission tomography (PET) to measure cerebral blood flow (CBF) in bilingual subjects.
  • Compared CBF patterns during word repetition tasks in L1 versus L2.

Main Results:

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  • A single significant difference in CBF was observed: increased activity in the left putamen during L2 word repetition compared to L1.
  • This finding suggests a specialized role for the left putamen in L2 production.

Conclusions:

  • The left putamen may be critical for the articulatory aspects of second language production.
  • Increased articulatory demands in L2 may necessitate enhanced motor control mediated by the putamen, potentially explaining foreign accent syndrome (FAS) after putaminal damage.