Understanding why predictable daily rhythms are one of the most powerful stabilisers of mood and neurobiology.
Allostasis is the body's ability to maintain stability through change — the active regulatory process that adjusts cortisol, heart rate, immune function and neurochemistry in response to demands.
When demands are chronic and unpredictable, allostatic systems become over-activated and inefficient. This cumulative "wear and tear" is called allostatic load. High allostatic load is associated with HPA-axis dysregulation, elevated baseline cortisol, reduced neuroplasticity and — critically — destabilised mood regulation.
Reducing unpredictability in daily timing lowers allostatic load by allowing the HPA axis to anticipate demands rather than react to them. Predictable routines convert reactive stress responses into proactive adaptations.
The suprachiasmatic nucleus (SCN) in the hypothalamus functions as the master biological clock, synchronising peripheral clocks throughout the body via light-dark cycles and social zeitgebers ("time-givers").
Irregularity in sleep timing, feeding schedules and social contact disrupts SCN entrainment. This desynchrony produces downstream effects on melatonin secretion, cortisol rhythmicity and serotonin/dopamine cycling — all directly implicated in mood episode generation.
AART defines four daily "anchor events" that function as personalised zeitgebers. Logging them daily makes deviations visible before they compound into prodromal rhythm disruption.
Depressive phases are characterised by behavioural withdrawal that reduces dopaminergic stimulation of the ventral striatum. This creates a self-reinforcing cycle: low activity → reduced reward → lower motivation → further withdrawal.
Structured social activity provides predictable, moderate reward stimulation that maintains basal dopaminergic tone without triggering the hyperstimulation associated with manic acceleration.
The AART protocol prescribes one graded social contact daily — calibrated to the current mood state. During low phases this may be a brief structured interaction; during high phases it involves avoiding novel hyper-stimulating environments.
| Concept | Mechanism | AART Target |
|---|---|---|
| Allostatic load | HPA-axis over-activation | Reduce via routine predictability |
| Circadian misalignment | SCN desynchrony | Anchor events as zeitgebers |
| Reward hypo/hyper-activity | Dopaminergic dysregulation | Graded social activation |
| Sleep irregularity | Melatonin/cortisol disruption | Fixed wake + sleep windows |
| Prodromal recognition | Early symptom detection | Daily self-monitoring log |