Objective: To study the effect of early exposure to pain on cerebral somatosensory evoked potential (SEP) response to thermal stimulation (550C), in preterm and full term born adolescents (15-18 years old), who have undergone painful procedures during their neonatal period. As well as to study the effect of early exposure to thermal and tactile sensory thresholds and pain thresholds to thermal and tactile stimuli, by using the TSA and von Frey hairs.