CONVULSION By N., Pam M.S. - April 7, 2013 noun. A non-deliberate, standardized, aggressive muscle contraction, sometimes of tonic nature, sometimes of clonic nature. CONVULSION: "Her sudden convulsions surprised and worried her family members that Thanksgiving." Related Psychology Terms EPILEPTIC CRY TONIC EPILEPSY TONIC-CLONIC SEIZURE GENERALIZED SEIZURE ISOTONIC CONTRACTION EXTRAFUSAL FIBER FLEXOR MUSCLE SCAPULAR REFLEX ISOMETRIC CONTRACTION TONIC Cite this page: N., Pam M.S., "CONVULSION," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/convulsion/ (accessed March 31, 2020).