| Abstract: | Somatosensory evoked potentials (SEP) investigations by median nerve stimulation and noncep-halic reference were carried out on 42 normals and5 patients. Normals showed 10070 presence of P14component with a mean latency of 14.0 ms in thefrontal as well as parietal recordings. Two opera-tions proved that cervical cord damaged patientsshow loss of P14 and other components when record-ed at the scalp while one patient with thalamichemorrhage showed persistent P14. Two patientswith CT proved lesions in the pontine area showedpreservation of P14 while other cortical componentsand BAEP were abnormal. According to our findings P14 probably originates at the lower pons ormedulla oblongata. |
