BIOLOGICAL CLOCK By N., Pam M.S. - April 7, 2013 The mechanism in every organism that controls timing of biological rhythms. In mammals it is located in the supraciliasmatic nucleus of the hypothalmus. See determinism. Compare environmental determinism. BIOLOGICAL CLOCK: "Lyn could feel her biological clock ticking as she got older." Related Psychology Terms BIOLOGICAL CLOCK ENVIRONMENTAL DETERMINISM BIOLOGICAL FACTOR SOFT DETERMINISM ANIMAL CIRCADIAN RHYTHM BIOLOGISM SUPRACHIASMATIC NUCLEUS (SCN) IN VIVO ECOLOGICAL NICHE BIOLOGISM Cite this page: N., Pam M.S., "BIOLOGICAL CLOCK," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/biological-clock-2/ (accessed August 18, 2019).