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Internal Desynchronisation in Blow Fly (Calliphora vicina) Locomotor Activity Rhythms: Evidence for a Complex Circadian Pacemaker

Author: Hong S-F.   Saunders D.S.  

Publisher: Taylor & Francis Ltd

ISSN: 0929-1016

Source: Biological Rhythm Research, Vol.29, Iss.4, 1998-10, pp. : 387-396

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Abstract

The majority of blow flies ( Calliphora vicina ) display circadian locomotor activity rhythms that free-run with an unchanging period (t) in darkness (DD), or entrain to a light-dark cycle (LD 1:23). However, a minority produce more complex patterns (spontaneous changes in t, arrhythmicity, or 'split' rhythms) in DD, or undergo rhythm dissociation ('internal desynchronisation') when the light pulses of LD 1:23 initially illuminate the subjective night. These patterns are interpreted as evidence for a complex, multioscillatory and multicellular, structure of the insects' circadian system, and this complexity is discussed in terms of the neuronal architecture of the fly's brain.

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