Theory 13/Circadian oscillator/Onset phase
Phase Is Set by Entrainment Rate
The claim
The phase of the circadian clock is set by the rate at which light advances it relative to the free-running period, so weak light still entrains if applied consistently.
01Mechanism
Phase shifts accumulate; the rate relative to period drift determines the stable phase.
02Prediction
Phase should track the entrainment rate.
03Refutation
Phase tracking light intensity would remove timing.