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Abstract #3445

Somatotopic Mapping at 7T Using a Natural Stimulus.

Juliane Farthouat1, Roberto Martuzzi2, Wietske van der Zwaag, 1,3, Sebastian Dieguez2, Silvio Ionta2, Olaf Blanke2, Rolf Gruetter, 1,3

1CIBM, EPFL, Lausanne, Vaud, Switzerland; 2Laboratory of Cognitive Neuroscience, EPFL, Lausanne, Vaud, Switzerland; 3Radiology, Universit de Lausanne, Lausanne, Vaud, Switzerland

Identification of digit representation in primary somatosensory cortex is hampered by the small distances between finger representations and the high inter-subject variability. In this study, the high BOLD sensitivity and spatial resolution available at ultra-high field were employed for somatotopic mapping using a natural somatosensory stimulus. Consistent somatotopic maps were acquired in BA 3b for four individual subjects as well as in BA 2 for two subjects. Digits representations were located consecutively in the brain, with the thumb positioned most anterior, inferior and distal. Inter-digit Euclidian distance was XX XX mm (mean stderr).