Chen, T. L., Babiloni, C., Ferretti, A., Perrucci, M. G., Romani, G. L., Rossini, P. M., Tartaro, A., & Del Gratta, C. (2008). Human Secondary Somatosensory Cortex Is Involved in the Processing of Somatosensory Rare Stimuli: An fMRI Study. Neuroimage, 40, 1765-1771.