FREE-RUNNING RHYTHM By N., Pam M.S. - May 11, 2013 the term for the cycle of behavior or physiological activity that occurs if external stimuli do not provide entrainment. See also biological rhythm. FREE-RUNNING RHYTHM: "Free running rhythm is a cycle of behaviour." Related Psychology Terms BIOLOGICAL CLOCK BIOLOGICAL RHYTHM BASIC REST-ACTIVITY CYCLE (BRAC) BIOPSYCHOLOGY, BIOLOGICAL RHYTHM ULTRADIAN RHYTHM BIOLOGISM BIOLOGICAL FACTOR RITUALIZATION BRAIN BIORHYTHM BIORHYTHMS Cite this page: N., Pam M.S., "FREE-RUNNING RHYTHM," in PsychologyDictionary.org, May 11, 2013, https://psychologydictionary.org/free-running-rhythm/ (accessed July 19, 2019).