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Abstract #0876

A Probabilistic Atlas of Digit Somatotopy in the Human Primary Somatosensory Cortex

Ayan Sengupta1, Denis Schluppeck2, Eleanor Barrat1, Julien Besle3, Susan Francis1, and Rosa Sanchez Panchuelo1

1Sir Peter Mansfield Imaging Centre, School of Physics and Astronomy, University of Nottingham, Nottingham, United Kingdom, 2School of Psychology, University of Nottingham, Nottingham, United Kingdom, 3Department of Psychology, American University of Beirut, Beirut, Lebanon

A probabilistic atlas of the digit representations of the left and right hand in primary somatosensory cortex is formed. The atlas is generated in volume and surface standardized space from somatotopic maps of 21 right-handed subjects obtained using a travelling wave paradigm with vibrotactile stimuli. Metrics quantify the likelihood of a given position being assigned to a digit (full probability map) and the most probable digit for a position (maximum probability map), with the atlas validated using a leave-one-out cross validation procedure. This probabilistic atlas quantifies variability in healthy subjects and can be used as a reference in patient studies.

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