Qualitative similarities between the behavior of coupled oscillators and circadian rhythms

1978 ◽  
Vol 40 (6) ◽  
pp. 675-692 ◽  
Author(s):  
Theo Pavlidis
Keyword(s):  
Circadian Rhythms ◽  
Coupled Oscillators

scholarly journals Circadian desynchronization

2010 ◽  
Vol 1 (1) ◽  
pp. 153-166 ◽  
Author(s):  
Adrián E. Granada ◽  
Trinitat Cambras ◽  
Antoni Díez-Noguera ◽  
Hanspeter Herzel
Keyword(s):  
Circadian Rhythms ◽  
Suprachiasmatic Nucleus ◽  
Heterogeneous Network ◽  
Coupled Oscillators ◽  
Signal Analysis ◽  
Spectral Component ◽  
Multiple Outputs ◽  
Periodically Driven ◽  
Locomotor Patterns

The suprachiasmatic nucleus (SCN) coordinates via multiple outputs physiological and behavioural circadian rhythms. The SCN is composed of a heterogeneous network of coupled oscillators that entrain to the daily light–dark cycles. Outside the physiological entrainment range, rich locomotor patterns of desynchronized rhythms are observed. Previous studies interpreted these results as the output of different SCN neural subpopulations. We find, however, that even a single periodically driven oscillator can induce such complex desynchronized locomotor patterns. Using signal analysis, we show how the observed patterns can be consistently clustered into two generic oscillatory interaction groups: modulation and superposition. In seven of 17 rats undergoing forced desynchronization, we find a theoretically predicted third spectral component. Combining signal analysis with the theory of coupled oscillators, we provide a framework for the study of circadian desynchronization.

The Biological Clock and Sleep in the Elderly

2006 ◽  
Vol 19 (1) ◽  
pp. 45-51 ◽  
Author(s):  
Myriam Juda ◽  
Mirjam Münch ◽  
Anna Wirz-Justice ◽  
Martha Merrow ◽  
Till Roenneberg
Keyword(s):  
Circadian Rhythms ◽  
Biological Clock ◽  
The Elderly ◽  
Early Morning ◽  
Behavioral Changes ◽  
Older Age ◽  
Age Related ◽  
Theoretical Considerations ◽  
Sleep Difficulties ◽  
Circadian Biology

Abstract: Among many other changes, older age is characterized by advanced sleep-wake cycles, changes in the amplitude of various circadian rhythms, as well as reduced entrainment to zeitgebers. These features reveal themselves through early morning awakenings, sleep difficulties at night, and a re-emergence of daytime napping. This review summarizes the observations concerning the biological clock and sleep in the elderly and discusses the documented and theoretical considerations behind these age-related behavioral changes, especially with respect to circadian biology.

Circadian Rhythms: A Tutorial

1982 ◽  
Vol 27 (12) ◽  
pp. 931-932
Author(s):  
Gerald S. Wasserman
Keyword(s):  
Circadian Rhythms
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