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Figure 5 | Theoretical Biology and Medical Modelling

Figure 5

From: A model for generating circadian rhythm by coupling ultradian oscillators

Figure 5

Effect of light on the primary oscillator products P1 and P3. In constant darkness (Figure 2), the phases of the two primary oscillators coincide every 26.7 hours, thereby determining the free-running period of the forced oscillator. The effect of 24 hour light/dark periods is to change the period of the two primary oscillators and bring them into phase alignment once each "day", resulting in an entrainment of the circadian oscillator to the 24 period.

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