TY - JOUR
T1 - Cerebellar tdcs modulates neural circuits during semantic prediction
T2 - A combined tDCS-fMRI study
AU - D’Mello, Anila M.
AU - Turkeltaub, Peter E.
AU - Stoodley, Catherine J.
N1 - Funding Information:
This work was supported by National Institutes of Health Grant R15MH106957 to C.J.S. and Grant R21DC014087 (Multi-PI Grant) to C.J.S. and P.E.T. We thank Caitlin Barrett, Brianne Drury, and Stephanie Martin for data collection.
Publisher Copyright:
© 2017 the authors.
PY - 2017/2/8
Y1 - 2017/2/8
N2 - It has been proposed that the cerebellum acquires internal models of mental processes that enable prediction, allowing for the optimization of behavior. In language, semantic prediction speeds speech production and comprehension. Right cerebellar lobules VI and VII (including Crus I/II) are engaged during a variety of language processes and are functionally connected with cerebral cortical language networks. Further, right posterolateral cerebellar neuromodulation modifies behavior during predictive language processing. These data are consistent with a role for the cerebellum in semantic processing and semantic prediction. We combined transcranial direct current stimulation (tDCS) and fMRI to assess the behavioral and neural consequences of cerebellar tDCS during a sentence completion task. Task-based and resting-state fMRI data were acquired in healthy human adults (n = 32; μ = 23.1 years) both before and after 20 min of 1.5 mA anodal (n = 18) or sham (n = 14) tDCS applied to the right posterolateral cerebellum. In the sentence completion task, the first four words of the sentence modulated the predictability of the final target word. In some sentences, the preceding context strongly predicted the target word, whereas other sentences were nonpredictive. Completion of predictive sentences increased activation in right Crus I/II of the cerebellum. Relative to sham tDCS, anodal tDCS increased activation in right Crus I/II during semantic prediction and enhanced resting-state functional connectivity between hubs of the reading/language networks. These results are consistent with a role for the right posterolateral cerebellum beyond motor aspects of language, and suggest that cerebellar internal models of linguistic stimuli support semantic prediction.
AB - It has been proposed that the cerebellum acquires internal models of mental processes that enable prediction, allowing for the optimization of behavior. In language, semantic prediction speeds speech production and comprehension. Right cerebellar lobules VI and VII (including Crus I/II) are engaged during a variety of language processes and are functionally connected with cerebral cortical language networks. Further, right posterolateral cerebellar neuromodulation modifies behavior during predictive language processing. These data are consistent with a role for the cerebellum in semantic processing and semantic prediction. We combined transcranial direct current stimulation (tDCS) and fMRI to assess the behavioral and neural consequences of cerebellar tDCS during a sentence completion task. Task-based and resting-state fMRI data were acquired in healthy human adults (n = 32; μ = 23.1 years) both before and after 20 min of 1.5 mA anodal (n = 18) or sham (n = 14) tDCS applied to the right posterolateral cerebellum. In the sentence completion task, the first four words of the sentence modulated the predictability of the final target word. In some sentences, the preceding context strongly predicted the target word, whereas other sentences were nonpredictive. Completion of predictive sentences increased activation in right Crus I/II of the cerebellum. Relative to sham tDCS, anodal tDCS increased activation in right Crus I/II during semantic prediction and enhanced resting-state functional connectivity between hubs of the reading/language networks. These results are consistent with a role for the right posterolateral cerebellum beyond motor aspects of language, and suggest that cerebellar internal models of linguistic stimuli support semantic prediction.
KW - Cerebellum
KW - FMRI
KW - Language
KW - Neuromodulation
KW - Prediction
KW - TDCS
UR - http://www.scopus.com/inward/record.url?scp=85011990693&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85011990693&partnerID=8YFLogxK
U2 - 10.1523/JNEUROSCI.2818-16.2017
DO - 10.1523/JNEUROSCI.2818-16.2017
M3 - Article
C2 - 28069925
AN - SCOPUS:85011990693
SN - 0270-6474
VL - 37
SP - 1604
EP - 1613
JO - Journal of Neuroscience
JF - Journal of Neuroscience
IS - 6
ER -