Journal
JOURNAL OF NEUROSCIENCE
Volume 34, Issue 14, Pages 5029-5037Publisher
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.0106-14.2014
Keywords
brain connectivity; cerebellum; posterior parietal cortex; functional magnetic resonance imaging; noninvasive brain stimulation; verbal working memory
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Funding
- Federal Ministry of Education and Research (Bernstein Focus, State Dependencies of Learning) [01GQ0975, 18GL4DW4]
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Previous research has accumulated convincing evidence to show that the human cerebellum contributes to the short-term storage of verbal information, but its specific role in brain networks involved in phonological storage remains uncertain. In a randomized, crossover and sham-controlled design, we here combined transcranial direct current stimulation (tDCS), applied to the right cerebellum, with fMRI to investigate systematically the contribution of the human cerebellum to encoding, maintenance, and retrieval of verbal information. After anodal, but not cathodal, tDCS, we found a reduced item recognition capacity together with an attenuated neural signal from the right cerebellar lobule VIIb, specifically during the late encoding phase. Within this phase, tDCS furthermore affected task-associated functional connections between right cerebellar lobule VIIb and the posterior parietal cortex. These findings suggest that the right cerebellar lobule VIIb interacts with the posterior parietal cortex, specifically during the late stages of verbal encoding, when verbal information enters phonological storage.
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