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RDLPFC area of the brain encodes sentence polarity: a study using fMRI

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Abstract

In this study, we use functional magnetic resonance imaging (fMRI) in combination with multivoxel pattern analysis to address the question of how mental activities that correspond to sentence polarity (affirmative or negative sentences) are encoded in the brain. This approach allows us to investigate the role of left/right dorsolateral prefrontal cortex (DLPFC) in predicting the neural activity of fMRI associated with sentence polarities. Subjects in the experiment were asked to judge the matching of the presented picture with the meaning of affirmative and negative sentences. Our results highlight the role of RDLPFC in encoding of the related mental activity to sentence polarities such that the right hemisphere (RDLPFC) can predict sentence polarity with high accuracy as compared to the left hemisphere (LDLPFC), and that the negative sentences are decoded with high performance as compared to affirmative sentences from the RDLPFC across subjects. In addition, this experiment’s results show that negative sentences involve more syntactic structure than affirmative sentences.

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Acknowledgement

The authors would like to thank Prof. Tom Mitchell for providing the data for analysis. This work was funded by the Institute for Research in Fundamental Sciences (IPM), School of Cognitive Sciences.

Informed consent statement

All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2000. Informed consent was obtained from all patients for being included in the study.

Conflict of interest

M. Behroozi and M.R. Daliri declare that they have no conflicts of interest.

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Correspondence to Mohammad Reza Daliri.

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Behroozi, M., Daliri, M.R. RDLPFC area of the brain encodes sentence polarity: a study using fMRI. Brain Imaging and Behavior 9, 178–189 (2015). https://doi.org/10.1007/s11682-014-9294-z

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