Thanks! Lest it confuse anyone else, please note that that review is all about effects of tDCS on the cerebellum and not a review of tDCS on the cerebrum or other brain structures. The cerebelar tDCS itself seems to have many effects including cerebellar motor cortical inhibition, gait adaptation, motor behaviour, and cognition (learning, language, memory, attention), though.
Here's a general review of the effect of tDCS on language
""" Despite their heterogeneities, the studies we reviewed collect- ively show that tDCS can improve language performance in healthy subjects and in patients with aphasia ( fi gure 4). Although relatively transient, the improvement can be remark- able: Monti and colleagues 52 found an improvement of approxi- mately 30% and Holland and Crinion 63 report a gain of approximately 25% in speech performance in aphasic patients. Intriguingly, no report described negative results in aphasic patients. """
EDIT:
Interestingly, there's limited evidence that it can be effective for patients suffering from autism too. E.g. case study finding 40% reduction in abnormal behavior for a severe case and improved language learning for minimally verbal children with autism.
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