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1 Department of Respiratory
Medicine,
We have used
voluntary tongue contraction to test whether we can image activation of
the hypoglossal nuclei within the human brain stem by using functional
magnetic resonance imaging (fMRI). Functional images of the whole brain
were acquired in eight subjects by using T2-weighted echo planar
imaging (blood oxygen level development) every 6.2 s. Sequences of
images were acquired during 12 periods of 31-s "isometric"
rhythmic tongue contraction alternated with 12 periods of 31-s tongue
relaxation. Noise arising from cardiac- and respiratory-related
movement was removed either by filtration (high pass; cutoff 120 s) or
by inclusion in the statistical analysis as confounding effects of no
interest. For the group, tongue contraction was associated with
significant signal increases (P < 0.05 corrected for multiple comparisons) in the sensorimotor cortex,
supplementary motor area, operculum, insula, thalamus, and cerebellum.
For the group and for six of eight individuals, significant signal
increases were also seen within the medulla
(P < 0.001, predefined region of
interest with no correction for multiple comparisons); this signal is
most likely to reflect neuronal activation associated with the
hypoglossal motor nuclei. The data demonstrate that fMRI can be used to
detect, simultaneously, the cerebral and brain stem control of tongue movement.
functional magnetic resonance imaging; hypoglossal nucleus; genioglossus; medulla
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