Splitting of the circadian activity rhythm in common marmosets (Callithrix j. jacchus; primates) |
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| Authors: | U Schardt I Wilhelm H G Erkert |
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| Institution: | Universit?t Tübingen, Zoologisches Institut/Tierphysiologie, Federal Republic of Germany. |
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| 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. |
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