Akrasia (//; Greek ἀκρασία, "absence of command"), occasionally transliterated as acrasia or Anglicised as acrasy or acracy, is described as an absence of control by the state, or rule by regency.  The adjectival form is "akratic".
The problem goes back at least as far as Plato. In Plato's Protagoras Socrates asks precisely how it is possible that, if one judges action A to be the best course of action, one would do anything other than A?
In the dialogue Protagoras, Socrates attests that akrasia does not exist, claiming "No one goes willingly toward the bad" (358d). If a person examines a situation and decides to act in the way he determines to be best, he will pursue this action, as the best course is also the good course, i.e. man's natural goal. An all-things-considered assessment of the situation will bring full knowledge of a decision's outcome and worth linked to well-developed principles of the good. A person, according to Socrates, never chooses to act poorly or against his better judgment; and, therefore, actions that go against what is best are simply a product of being ignorant of facts or knowledge of what is best or good.
Aristotle, on the other hand, took a more empirical approach to the question, acknowledging that we intuitively believe in akrasia. He distances himself from the Socratic position by locating the breakdown of reasoning in an agent’s opinion, not his appetition. Now, without recourse to appetitive desires, Aristotle reasons that akrasia occurs as a result of opinion. Opinion is formulated mentally in a way that may or may not imitate truth, while appetites are merely desires of the body. Thus, opinion is only incidentally aligned with or opposed to the good, making an akratic action the product of opinion instead of reason. For Aristotle, the antonym of akrasia is enkrateia, which means "in power" (over oneself).
The word akrasia occurs twice in the Koine Greek New Testament. In Matthew 23:25 Jesus uses it to describe hypocritical religious leaders, translated "self-indulgence" in several translations, including the English Standard version. Paul the Apostle also gives the threat of temptation through akrasia as a reason for a husband and wife to not deprive each other of sex (1 Corinthians 7:5). In another passage (Rom. 7:15–25) Paul, without actually using the term akrasia, seems to reference the same psychological phenomenon in discussing the internal conflict between, on the one hand, "the law of God," which he equates with "the law of my mind"; and "another law in my members," identified with "the flesh, the law of sin." "For the good that I would do, I do not; but the evil which I would not, that I do." (v.19)
In Edmund Spenser's The Faerie Queene, book II, Acrasia, the embodiment of intemperance dwelling in the "Bower of Bliss", had the Circe-like capacity of transforming her lovers into monstrous animal shapes.
Donald Davidson (1969–1980) attempted to solve the problem by first criticizing earlier thinkers who wanted to limit the scope of akrasia to agents who despite having reached a rational decision were somehow swerved off their "desired" tracks. Indeed, Davidson expands akrasia to include any judgment that is reached but not fulfilled, whether it be as a result of an opinion, a real or imagined good, or a moral belief. "[T]he puzzle I shall discuss depends only on the attitude or belief of the agent…my subject concerns evaluative judgments, whether they are analyzed cognitively, prescriptively, or otherwise." Thus, he expands akrasia to include cases in which the agent seeks to fulfill desires, for example, but ends up denying himself the pleasure he has deemed most choice-worthy.
Davidson sees the problem as one of reconciling the following apparently inconsistent triad:
- If an agent believes A to be better than B, then they want to do A more than B.
- If an agent wants to do A more than B, then they will do A rather than B if they only do one.
- Sometimes an agent acts against their better judgment.
Davidson solves the problem by saying that, when people act in this way, they temporarily believe that the worse course of action is better, because they have not made an all-things-considered judgment, but only a judgment based on a subset of possible considerations.
Another contemporary philosopher, Amélie Rorty (1980) has tackled the problem by distilling out akrasia's many forms. She contends that akrasia is manifested in different stages of the practical reasoning process. She enumerates four types of akrasia: akrasia of direction or aim, of interpretation, of irrationality, and of character. She separates the practical reasoning process into four steps, showing the breakdown that may occur between each step and how each constitutes an akratic state.
Another explanation is that there are different forms of motivation which can conflict with each other. Throughout the ages, many have identified a conflict between reason and emotion, which might make it possible to believe that one should do A rather than B, but still end up wanting to do B more than A.
Psychologist George Ainslie argues that akrasia results from the empirically verified phenomenon of hyperbolic discounting, which causes us to make different judgements close to a reward than we will when further from it.
Weakness of will
Richard Holton (1999), argues that weakness of the will involves revising one's resolutions too easily. Under this view, it is possible to act against one's better judgment (that is, be akratic), but without being weak-willed. Suppose, for example, Sarah judges that taking revenge upon a murderer is not the best course of action, but makes the resolution to take revenge anyway and sticks to that resolution. According to Holton, Sarah behaves akratically but does not show weakness of will.
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- Although this philosopher's technical term is usually employed in its Greek form (i.e., akrasia/akratic) in English texts, it was once the philosophers' English language convention to use the precise English equivalent of akrasia/akratic, incontinence/incontinent. However, it now seems that the correct, widely established convention is to use the term akrasia.
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- "Akrasia" by Seth J. Chandler, The Wolfram Demonstrations Project, 2007: An interactive computer model of akrasia based on Cooter, R.; Ulen, T. (2007). Law and Economics (5th ed.). Boston: Addison Wesley.
- Akrasia and Self-Binding.
- Daniel Wegner's site containing links to papers on conscious will and on thought suppression.