NYCTOPHONIA By N., Sam M.S. - 5 noun. A range of selective mutism wherein the youth talks at night time but remains mute for the duration of day time. NYCTOPHONIA: "Cole was diagnosed with nycophonia when he was seven years old." Related Psychology Terms Discrimination and Mental Illness in the LGBT Population ADOLESCENCE (Theories) Dissociative Identity Disorder Piaget’s Theory of Cognitive Development DREAM-STATE (D-STATE, REM- STATE) A Comparison of Maternal and Paternal Filicide JUVENILE PARESIS Hitler and Conformity REGRESSION HEARING (AUDITION) Cite this page: N., Sam M.S., "NYCTOPHONIA," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/nyctophonia/ (accessed December 4, 2022).