Difficulties to separate sensory and motor activations in fMRI studies limited the potentialities of the technique to study mechanisms of plasticity and processes of re-organization occurring in primary somatosensory area after brain lesions. Here we present the results of the use of a tactile stimulus developed ad hoc to investigate this area at different magnetic fields. The tactile stimulator is able to activate selectively a specific area in post-central region at 3T and 7T, and thanks to its safety and handiness it seems a useful tool to study (re-)organization processes in patients with brain lesion.
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