Regret is the emotion of wishing one had made a different decision in the past, because the consequences of the decision one did make were unfavorable. Regret is related to perceived opportunity. Its intensity varies over time after the decision, in regard to action versus inaction, and in regard to self-control at a particular age. The self-recrimination which comes with regret is thought to spur corrective action and adaptation. In Western societies adults have the highest regrets regarding choices of their education. Definition Regret has been defined by psychologists in the late 1990s as a "negative emotion predicated on an upward, self-focused, counterfactual inference". Another definition is "an aversive emotional state elicited by a discrepancy in the outcome values of chosen vs. unchosen actions". Regret differs from remorse in that people can regret things beyond their control, but remorse indicates a sense of responsibility for the situation. For example, a person can feel regret that people die during natural disasters, but cannot feel remorse for that situation. However, a person who intentionally harms someone should feel remorse for those actions. Agent regret is the idea that a person could be involved in a situation, and regret their involvement even if those actions were innocent, unintentional, or involuntary. For example, if someone decides to die by stepping in front of a moving vehicle, the death is not the fault of the driver, but the driver may still regret that the person died. Regret is distinct from disappointment. Both are negative emotional experiences relating to a loss outcome, and both have similar neuronal correlates. However, they differ in regard to feedback about the outcome, comparing the difference between outcomes for the chosen vs. unchosen action; In regret, full feedback occurs and with disappointment partial feedback. They also differ in regard to agency (self in regret versus external in disappointment). Models There are conceptual models of regret in regret (decision theory) mostly in theoretical economics and finance under a field called behavioral economics. Anticipated regret, or how much regret one thinks one will feel in the future, appears to be overestimated for actions and choices. This appears to be, in part, due to a tendency to underestimate the extent to which people attribute bad outcomes to external factors rather than to internal factors (i.e., themselves). It can lead to inaction or inertia and omission bias. Existential regret has been specifically defined as "a