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Incomplete on-axis (off-axis) MN sensory mapping by a 2 x 4 grid with a triphasic PR, including a P25 response. The PR is between G1/G2 and G6/G7 localizing the CS (red line). The responses from G1, G5, and G6 are postcentral, and G2, G3, G4, G7, and G8 are precentral.
MN, median nerve; PR, phase reversal; CS, central sulcus
