The results of this dissertation reveal that specific vibrotactile stimulation of the sole of the foot, when analyzed at a group level, reliably activates lower extremity areas of the sensorimotor cortex. The stimuli applied in this study lead to activation in the contralateral SM1, bilateral in SII, in the supplementary motor cortex and in subcortical centers.
When analyzed at an individual level, however, fMRI results were quite heterogenous. None of the parameters evaluated likewise induced robust cerebral reactions in all participating probands. Using several different vibration stimuli within one measurement procedure distinctly increased the probability of a significant BOLD answer though. The first-time application of amplitude modulation in vibration stimulation of the sole of the foot did not influence fMRI results at a group level but induced a significant BOLD answer only in some individual cases. On the other hand, amplitude augmentation caused a significant decrease of activity in the premotoric cortex.
The fMRI results of this study demonstrate that the suggested approach in principle is suitable for assessing the sensorimotoric system. Future areas of application of vibrotactile stimulation include functional neurological diagnostics and prognostics, rehabilitation of neurological disorders like the apallic syndrome, the bedrest syndrome, the space adaptation syndrome (space sickness), and extrapyramidal-motor disorders.
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The results of this dissertation reveal that specific vibrotactile stimulation of the sole of the foot, when analyzed at a group level, reliably activates lower extremity areas of the sensorimotor cortex. The stimuli applied in this study lead to activation in the contralateral SM1, bilateral in SII, in the supplementary motor cortex and in subcortical centers.
When analyzed at an individual level, however, fMRI results were quite heterogenous. None of the parameters evaluated likewise induced...
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