This is a Lexicon entry: the mechanism, when it shows up, and the countermeasure. The full correction, with real-world cases and the audit prompt, hasn't been written yet.
Definition
The theory that self-control draws on a limited cognitive resource - analogous to a fuel supply - which depletes with use and recovers with rest. Note: the glucose/resource-depletion model has failed large-scale replication; the phenomenon may exist in weaker form. Note: The mechanism underlying this effect - whether it involves a genuine resource, a motivational shift or a learned expectation - is not currently understood well enough to specify which countermeasures address the actual cause. When it shows up: Late in a day of resisting temptation. Stressful situations that require sustained willpower. Multiple self-control demands in sequence.
Failure mode
Self-control resources deplete. Later demands fail that earlier demands would have resisted. The person is not weak; they are out of capacity.
Countermeasure
Reduce demand through design. Remove temptations, automate defaults, schedule demanding work to high-resource windows. Less willpower needed means more available when it matters.
Related concepts
Also connected in the mapDecision Fatigue·Procrastination Bias·Willpower Fatigue·The Hungry Judge Effect
Origin
Also revealed
Entry #618 of 631 in The Lexicon · see the full Lexicon