..... Click the link for more information. , although many philosophers have attempted to reconcile the two concepts. Thomas Hobbes, identifying the will with appetites and defining freedom as the absence of impediments, concluded that free will exists where nothing prevents a person from satisfying his prevailing appetite. David Hume argued that a person's willful conduct counts as freely chosen even though his will has itself been determined by his motives. William James called such attempts to fit notions of free will into determinist systems "soft" determinism; "hard" determinism excludes the possibility of free will altogether. The doctrine of determinism is opposed by the principle of emergence, which states that truly novel and unpredictable events may occur out of the composite forces of nature.
determinism
In philosophy, the doctrine that all events, including human decisions, are completely determined by previously existing causes. The traditional free will problem arises from the question, Is moral responsibility consistent with the truth of determinism? Among those who believe it is not consistent, some, maintaining the truth of determinism, have concluded that no one is morally responsible for what he does (and therefore that punishment for criminal actions is unjustified); others, maintaining the reality of moral responsibility, have concluded that determinism is false. Those who believe that moral responsibility is consistent with determinism are known as compatibilists (see compatibilism). Pierre-Simon Laplace is responsible for the classical formulation of determinism in the 18th century. For Laplace, the present state of the universe is the effect of its previous state and the cause of the state that follows it. If a mind, at any given moment, could know all the laws and all the forces operating in nature and the respective positions and momenta of all its components, it could thereby know with certainty the future and the past of every entity.
determinism
determinism [də′tər·mə‚niz·əm]
Determinism
The principle that nature follows exact laws, so that what will happen in the future is a necessary consequence of the state of the world at any given moment in the past. This view, if fully adopted, implies that events which seem to occur by chance would be fully understood if more was known about them, and that apparently free thoughts and choices are explainable and in principle predictable in terms of neuroscience. In a looser sense, determinism refers to claims that mental freedom is much more restricted than people are inclined to suppose.
The question of determinism in physical science cannot be considered apart from the philosophical problem; this gives it added importance and forces its consideration in a very critical spirit.
The idea that the world is composed of atoms moving under the influence of certain forces according to certain laws can be traced back to the Greek philosopher Leucippus. Deterministic philosophy was prominent in the work of the seventeenth-century thinker René Descartes, and became widely known through his influence. Isaac Newton carried out a large part of the cartesian program. His theory explained so many natural processes that it began to appear that the universe since the time of Creation might actually have run its course in a deterministic fashion like a machine, without divine intervention. A century after Newton, Pierre Simon de Laplace argued that an Omniscient Calculator, provided with exact knowledge of the state of the universe at present, would be able to predict the entire future. See Classical mechanics, Newton's laws of motion
The quantum mechanics of the 1920s introduced the paradox of particles which are, at the same time, waves. A wave of length λ was supposed to accompany, or describe, a particle of momentum p = h/λ, where h is Planck's constant. The probability of finding a free particle is expressed by a (complex) wave packet (see illustration), and the particle has appreciable probability of being found only where the wave function is large; that is, within a region of size roughly Δx on each side of x0 in the illustration. A theorem of Fourier analysis shows that Δp, the range of momenta present in the wave packet, is related to Δx as shown below.
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There remains the question as to whether Heisenberg's principle is merely an unfortunate limitation on an experimenter's ability to know or whether it goes deeper. The general opinion of physicists is that of N. Bohr: the principle expresses a limitation of the precision with which concepts such as position and momentum can be applied at all. Therefore Laplace's Omniscient Calculator cannot predict the future. See Quantum mechanics, Uncertainty principle
Perceptive mathematicians have warned that determinism is not as obvious a consequence of newtonian physics as it might appear. A series of mathematical results have been proven whose general effect is that for the vast majority of dynamical systems any error in the initial conditions, however small, will be amplified, in general exponentially, and so quickly that the predicted result will soon bear no relation to reality. Thus unless it is assumed that initial conditions are known with perfect accuracy, and perfectly accurate computation takes place thereafter, the Omniscient Calculator will wind up getting everything wrong. See Chaos
Very few people now think that all events in the natural world are exactly determined. Experiments suggest that some human and animal behavior can reliably be predicted and controlled, but nobody knows the limits within which this can be done.
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