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Abstract #3927

Investigating digit representation and tactile attention in SI/SII with a novel paradigm

Rosa Sanchez Panchuelo 1 , Keren Yang 1 , Martin Buehrer 2 , Miles Humberstone 3 , and Susan Francis 1

1 University of Nottingham, Nottingham, United Kingdom, 2 Gyrotools, Zurich, Switzerland, 3 Nottingham University Hospitals Trust, Nottingham, United Kingdom

We investigate digit representation and tactile attention in SI and SII with high spatial resolution at 7T. fMRI was performed during a novel task to modulate spatial attention between digits 2, 3 and 4 during stimulation of the digits of the left hand, each with a different periodicity. This novel paradigm revealed a clear digit somatotopy within SI, but no modulation to attention. In contrast, no somatotopic map was seen in SII, with digit responses largely overlapping, whilst SII and other cortical areas, such as SMA and pre-SMA, were strongly modulated by tactile attention in an overlapping manner.

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