"Somatosensory evoked potentials (SEPs) may also provide evidence of pain processing in the somatosensory cortex, although they are not used clinically to test pain pathways. SEPs test the dorsal column tract of the spinal cord, which transmits visceral pain sensation to the somatosensory cortex via the thalamus. SEPs with distinct and constant N1 components of normal peak latency are present at 29 weeks’ PCA, indicating that thalamic connections with the somatosensory cortex are functional at that time."