Buridan's ass is a figurative description of a man of indecision. It refers to a
paradoxical situation wherein an ass, placed exactly in the middle between two stacks of hay of equal size and quality, will starve to death since it cannot make any rational decision to start eating one rather than the other. The paradox is named after the 14th centuryFrench philosopher Jean Buridan.
The paradox was not originated by Buridan himself. It is first found in
Aristotle's " De Caelo", where Aristotle mentions an example of a man who remains unmoved because he is as hungry as he is thirsty and is positioned exactly between food and drink. Buridan nowhere discusses this specific problem but its relevance is that he did advocate a moral determinismwhereby, save for ignorance or impediment, a human faced by alternative courses of action must always choose the greater good. Buridan allowed that the will could delay the choice to more fully assess the possible outcomes of the choice. Later writers satirised this view in terms of an ass who, confronted by two equally desirable and accessible bales of hay, must necessarily starve while pondering a decision.
Some proponents of
hard determinismhave granted the unpleasantness of the scenario, but have denied that it illustrates a true paradox, as such, since one does not contradict oneself in suggesting that a man might die between two equally plausible routes of action. For example, Baruch Spinozain his "Ethics", suggests that a person who sees two options as truly equally compelling cannot be fully rational: Quotation| [I] t may be objected, if man does not act from free will, what will happen if the incentives to action are equally balanced, as in the case of Buridan's ass? [In reply,] I am quite ready to admit, that a man placed in the equilibrium described (namely, as perceiving nothing but hunger and thirst, a certain food and a certain drink, each equally distant from him) would die of hunger and thirst. If I am asked, whether such an one should not rather be considered an ass than a man; I answer, that I do not know, neither do I know how a man should be considered, who hangs himself, or how we should consider children, fools, madmen, &c.| Baruch Spinoza|Ethics, Book 2, Scholium
Other writers have opted to deny the validity of the illustration. A typical counter-argument is that
rationalityas described in the paradox is so limited as to be a straw manof the real thing, which does allow the consideration of meta-arguments. In other words, it's entirely rational to recognize that both choices are equally good and arbitrarily pick one instead of starving. This counter-argument is sometimes used as an attempted justification for faith. The argument is that, like the starving ass, we must make a choice in order to avoid being frozen in endless doubt. Other counter-arguments exist.
Buridan's ass sometimes finds mention in
electrical engineering. Specifically, in digital logic, an analog-to-digital convertermust convert a continuous voltagevalue into either a 0 or a 1. The voltage value represents the position of the ass, and the values 0 and 1 represent the bales of hay. Like the situation of the starving ass, there exists an input on which the converter cannot make a proper decision, resulting in a metastable state. Having the converter make an arbitrary choice in ambiguous situations does not solve the problem, as the boundary between ambiguous values and unambiguous values introduces another binarydecision with its own metastable state. In the ass illustration, the ass cannot decide whether or not to choose arbitrarily and so starves to death.
In popular culture
Devosong "Freedom of Choice" refers to this paradox (but substitutes a dog for a donkey).
*In an episode of "
Boy Meets World", Shawn's college philosophy professor poses this paradox, also substituting a dog.
Doctor Whonovel " The Eight Doctors", the fifth and eighth Doctors use the principle to confuse a Raston Warrior Robot.
Metastability in electronics
Dining philosophers problem
Spontaneous symmetry breaking
* [http://www.pnas.org/content/105/31/10635.full Competing interactions create functionality through frustration] , Vassiliy Lubchenko, PNAS August 5, 2008 vol. 105 no. 31 10635-10636
* Zupko, Jack (2003) "John Buridan. Portrait of a Fourteenth-Century Arts Master". Notre Dame, Indiana: University of Notre Dame Press. "(cf. pp. 258, 400n71)"
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buridan's ass — ˈbyu̇rədənz , dənz noun Usage: usually capitalized B Etymology: after Jean Buridan died ab1358 French philosopher, who is reputed to have posed the problem : a hypothetical dilemma in which a person is postulated as presented with two equally… … Useful english dictionary
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