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Thematic role assignment in the posterior parietal cortex: A TMS study.

Chiara Finocchiaro1, Rita Capasso2, Luigi Cattaneo3

  • 1Dipartimento di Psicologia e Scienze Cognitive, Università di Trento, Trento, Italy.

Neuropsychologia
|August 31, 2015
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Summary

Investigating thematic roles in language, repetitive transcranial magnetic stimulation (rTMS) targeted the left parietal lobe. Posterior parietal stimulation enhanced understanding of complex passive sentences, suggesting its specific role in thematic role processing.

Keywords:
Brain mappingNatural language processingPosterior parietal lobeReanalysisThematic role assignmentTranscranial magnetic stimulation

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Area of Science:

  • Neuroscience
  • Psycholinguistics
  • Cognitive Science

Background:

  • Verbs link entities through thematic roles, crucial for sentence comprehension.
  • Thematic roles involve both semantic and syntactic processing.
  • Passive sentences require thematic reanalysis due to reversed word order.

Purpose of the Study:

  • To investigate the involvement of left parietal sites in thematic role understanding.
  • To determine if repetitive transcranial magnetic stimulation (rTMS) affects thematic role processing.
  • To differentiate the role of parietal sites in sentence comprehension and word-picture association.

Main Methods:

  • Used repetitive transcranial magnetic stimulation (rTMS) on three left parietal sites (anterior, middle, posterior).
  • Participants performed a sentence-to-picture matching task with active and passive sentences.
  • Stimulation was event-related, time-locked to visual stimuli presentation.

Main Results:

  • Posterior parietal stimulation significantly increased accuracy for passive sentences.
  • The observed effect was TMS-related, confirmed by a no-TMS control experiment.
  • No TMS effects were found in a picture-word matching task, indicating specificity beyond general semantic processing.

Conclusions:

  • The posterior parietal cortex is specifically involved in thematic role assignment.
  • This region is particularly important when sentence interpretation requires reanalysis of thematic roles, as in passive sentences.
  • rTMS can be used to probe the neural basis of complex linguistic processes like thematic role understanding.