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Bilateral basal ganglia activity in verbal working memory
Anna Bacon Moore1, Zhihao Li, Callie E Tyner
1Atlanta VAMC, Decatur, GA, USA. annamoore@westminster.net
Brain and Language
|August 3, 2012
Summary
This study reveals how subcortical structures, including the basal ganglia, contribute to verbal working memory. Brain imaging highlights distinct neural activity patterns during encoding, maintenance, and retrieval.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Neuroimaging
Background:
- Cortical involvement in verbal working memory is well-established.
- The role of subcortical structures, particularly the basal ganglia, remains less understood.
- Existing models often lack detailed subcortical integration.
Purpose of the Study:
- To elaborate a model of verbal working memory incorporating the basal ganglia.
- To investigate neural function across the entire verbal working memory process (encoding to retrieval).
- To identify specific subcortical contributions to verbal working memory stages.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was employed.
- Neurologically normal participants performed a verbal working memory task.
- Brain activation patterns were analyzed during encoding, maintenance, and retrieval phases.
Main Results:
- A typical frontal-parietal network was active throughout the task.
- Encoding involved left inferior frontal regions, caudate, and thalamus.
- Maintenance engaged medial thalamus and posterior cingulate; retrieval activated inferior frontal sulcus and parietal/occipital regions.
Conclusions:
- Subcortical structures, including the basal ganglia (caudate, thalamus), play a significant role in verbal working memory.
- Distinct neural networks, encompassing both cortical and subcortical regions, support different phases of verbal working memory.
- Findings refine current models by integrating subcortical contributions to verbal working memory function.
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