K COMPLEX By Nugent, Pam M.S. - May 11, 2013 a brief characteristic of electrical activity recorded from the brain during the early stages of sleep. It may also be associated with nocturnal epileptic seizures. K COMPLEX: "K Complex is a brief characteristic of electrical activity from the brain. " Related Psychology Terms SLEEP STAGES NONEPILEPTIC SEIZURE (NES) BRAIN WAVES GENERALIZED SEIZURE GAMMA MOTION, GAMMA SYNCHRONY BRAIN MAPPING POSTTRAUMATIC EPILEPSY EPILEPSY SURGERY BRAIN POTENTIAL SENSORIMOTOR RHYTHM (SMR) Cite this page: Nugent, Pam M.S., "K COMPLEX," in PsychologyDictionary.org, May 11, 2013, https://psychologydictionary.org/k-complex/ (accessed January 20, 2019).