Journal
BRAIN RESEARCH
Volume 1133, Issue 1, Pages 136-144Publisher
ELSEVIER
DOI: 10.1016/j.brainres.2006.11.074
Keywords
cerebellum; basal ganglia; putamen; language; phonological; dynamic causal modeling; effective connectivity; initiation; amplification; refinement
Categories
Funding
- NICHD NIH HHS [HD042049, R01 HD042049, R56 HD042049] Funding Source: Medline
- NIDCD NIH HHS [DC06149, R21 DC006149] Funding Source: Medline
- NINDS NIH HHS [NS44383, NS44837, R01 NS044837] Funding Source: Medline
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The roles of the cerebellum and basal ganglia have typically been confined in the literature to motor planning and control. However, mounting evidence suggests that these structures are involved in more cognitive domains such as language processing. In the current study, we looked at effective connectivity (the influence that one brain region has on another) of the cerebellum and basal ganglia with regions thought to be involved in phonological processing, i.e. left inferior frontal gyrus and left lateral temporal cortex. We analyzed functional magnetic resonance imaging data (fMRI) obtained during a rhyming judgment task in adults using dynamic causal modeling (DCM). The results showed that the cerebellum has reciprocal connections with both left inferior frontal gyrus and left lateral temporal cortex, whereas the putamen has unidirectional connections into these two brain regions. Furthermore, the connections between cerebellum and these phonological processing areas were stronger than the connections between putamen and these areas. This pattern of results suggests that the putamen and cerebellum may have distinct roles in language processing. Based on research in the motor planning and control literature, we argue that the putamen engages in cortical initiation while the cerebellum amplifies and refines this signal to facilitate correct decision making. (c) 2006 Elsevier B.V. All rights reserved.
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