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Decision Fatigue: Why Judges Grant Parole More Before Lunch
psychology

Decision Fatigue: Why Judges Grant Parole More Before Lunch

April 2, 2026 · 3 min read

The Fact

Decision fatigue is so real that Israeli judges approved parole for 65% of prisoners at the start of the day but under 10% right before a break, regardless of the actual merits of each case.

The Parole Board Study

In 2011, researchers Shai Danziger, Jonathan Levav, and Liora Avnaim-Pesso published an analysis of 1,112 parole decisions made by experienced Israeli judges over a ten-month period. The dataset had an unexpected pattern: the probability of a favorable parole ruling was approximately 65% at the start of each session, dropped steadily to near zero as the session progressed, and then spiked back up to 65% immediately after each break — whether that break was for lunch or a mid-morning rest.

The researchers controlled for the type of offense, the prisoner's criminal history, the presence of a rehabilitation program, and the presence of an attorney. None of these factors explained the pattern. What predicted the ruling was simply when in the session it was heard. Prisoners who happened to be scheduled early in a session after a break received favorable consideration at the same rate regardless of their case merits. Those at the end of a long, unbroken stretch were denied at rates exceeding 90%.

The Depletion Mechanism

Decision fatigue operates through a mechanism closely related to ego depletion: the hypothesis that the cognitive resources involved in making effortful decisions are finite and diminish with use. Each decision made draws on a shared pool of mental energy. As that pool depletes, the mind shifts to default options — the status quo, the safe choice, the option that requires no justification.

For judges, denial is the default. Releasing a prisoner carries risk; denying parole is safe. A fatigued judge is not making a worse decision in a morally blameworthy sense — the brain is genuinely degraded in its capacity to engage with complexity and weigh competing considerations. The ruling "denied" requires no evaluation; it is the path of least resistance. Food and rest restore the resource pool, which is why rulings immediately after breaks return to their more considered baseline.

Implications for High-Stakes Decisions

Decision fatigue has been observed in medical contexts, legal settings, financial advising, and consumer behavior. Physicians order more unnecessary tests and prescribe more antibiotics at the end of clinic sessions than at the beginning. Financial advisors recommend riskier default options as the trading day progresses. Shoppers make more impulse purchases and choose more indulgent items later in shopping trips.

The practical implication is straightforward: schedule important decisions early in the day or immediately after a break, keep decision lists short, and structure decisions so that they require genuine engagement rather than passive default. For systems that generate high-stakes decisions at scale — courts, medical panels, hiring committees — rotating panel schedules and mandatory breaks are not courtesies but evidence-based requirements for consistent judgment.

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FactOTD Editorial Team

Published April 2, 2026 · 3 min read

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