title: Splitting of the circadian activity rhythm in common marmosets (Callithrix j. jacchus; primates).
abstract: Long-term recordings of the free-running circadian activity rhythm in common marmosets, Callithrix j. jacchus, living under constant environmental conditions (LL 200-470 lx) provided evidence of rhythm splitting in nonhuman primates. In two out of ten test animals two different types of splitting occurred; spontaneous persistent splitting and temporary splitting. Neither a reduction of the illumination intensity nor the application of dark pulses had any effect on the two activity components of the persistently split rhythm.
authors.affiliation: Universität Tübingen, Zoologisches Institut/Tierphysiologie, Federal Republic of Germany.
authors.forename: U
authors.initials: U
authors.lastname: Schardt
authors.forename: I
authors.initials: I
authors.lastname: Wilhelm
authors.forename: H G
authors.initials: HG
authors.lastname: Erkert
mesh_terms: D000204:Activity Cycles / Q000502:physiology*; D000818:Animals; D002144:Callithrix / Q000502:physiology*; D002143:Callitrichinae / Q000502:physiology*; D002940:Circadian Rhythm / Q000502:physiology*; D005260:Female; D008027:Light; D008297:Male; D010507:Periodicity