| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Outline of Final Research Achievements |
Sophisticated tongue movements are essential to swallowing in humans. These fine movements are regulated by descending motor signals from the cortex to the muscles, and by afferent sensory feedback from the muscles to the cortex. We demonstrated the oscillatory synchronization between cortical activity and muscle activity during isometric tongue protrusions in humans. The synchronization was observed at two frequency bands: the β band at 15-35 Hz and a low-frequency band at 2-10 Hz (Neuroimage 2014; 2016). The synchronization at the β band mainly reflects the motor commands from the motor cortex to the tongue. In contrast, the synchronization at a low-frequency band reflects the proprioceptive afferent feedback from the tongue to the somatosensory cortex. Such bidirectional flow of oscillatory information between the cortex and the tongue may be critical to coordination of sophisticated tongue movements in humans.
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