“…Somatosensory evoked potentials (SEPs) by peripheral nerve stimulation are captured in electroencephalogram (EEG) and allow the quantitative assessment of the integrity of the somatosensory pathway. They are divided into three components, including i) the peripheral potential (N9) reflecting the afferent volley at the level of the plexus brachialis, ii) the early cortical SEPs (N20, P25, N30 and P35) whose activity sources are located in the primary somatosensory area (S1) and the motor cortex, and iii) the late cortical SEPs (P45, N60, P100 and N120) involving the secondary somatosensory area (S2) and associative areas (Giblin, 1964;Woolsey et al, 1979;Drechsler, 1980;Shahani et al, 1980, Small, 1980Anziska and Cracco, 1983;Allison et al, 1992;Mauguiere et al, 1997Mauguiere et al, , 1999Urbano et al, 1997;Torquati et al, 2002;Mauguiere, 2005;Papadelis et al, 2011;Aspell et al, 2012;Saradjian et al, 2013). Early SEPs mainly depend on peripheral inputs and are primarily involved in stimulus perception (intensity, location) (Halgren et al, 1998;Torquati et al, 2002;Lim et al, 2012).…”