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The '''Standard Model''' of particle physics is the mathematical theory that describes the [[weak force|weak]], [[Maxwell's equations|electromagnetic]] and [[Strong force|strong]] interactions between [[lepton]]s and [[quark]]s, the basic particles of particle physics. This model is very strongly supported by experimental observations, and is considered to be a major achievement (perhaps the most outstanding achievement) of theoretical physics. It does not, however, treat the [[Gravitation|gravitational force]], inclusion of which remains an elusive goal of the ultimate "theory of everything". The Standard Model is accordingly not consistent with [[general relativity]]. The theory is consistent with [[special relativity]].
In [[philosophy]] the term '''free will''' refers to consideration of whether an individual has the ability to make decisions or, alternatively, has only the illusion of doing so. It is an age-old concern to separate what we can do something about, choose to do, from what we cannot.  The underlying quandary is the idea that science suggests future events are dictated to a great extent, and perhaps entirely, by past events and, inasmuch as the human body is part of the world science describes, its actions also are determined by physical laws and are not affected by human decisions. This view of events is a particular form of ''determinism'', sometimes called ''physical reductionism'',<ref name=Ney/>  and the view that determinism precludes free will is called ''incompatibilism''.<ref name=Vihvelin/> 


The model is only qualitatively described in this article, and mathematical details are not provided. To begin, the basic particles in the Standard Model and their interactions are introduced.
There are several ways to avoid the incompatibilst position, resulting in various ''compatibilist'' positions.<ref name=Timpe/>  One is to limit the scope of scientific description in a manner that excludes human decisions. Another is to argue that even if our actions are strictly determined by the past, it doesn’t seem that way to us, and so we have to find an approach to this issue that somehow marries our intuition of independence with the reality of its fictional nature. A third, somewhat legalistic approach, is to suggest that the ‘will’ to do something is quite different from actually doing it, so ‘free will’ can exist even though there may be no freedom of action.  


==Particles and interactions==
There is also a theological version of the dilemma. roughly, if a deity or deities, or 'fate', controls our destiny, what place is left for free will?
The interactions between the particles of the Standard Model are well known experimentally, and transcend the Standard Model. However, the particles of the Standard Model are introduced with the ways that they use these interactions to assemble a complete theory of the interactions between various manifestations of matter. The fundamental particles are spin 1/2 [[fermion]]s of two ''types'': [[lepton]]s and [[quark]]s. Their interactions are viewed as ''exchange forces'', which is to say the forces are introduced by the trading back and forth of ''force carriers'', different kinds of particle that represent [[quantum theory|quanta]] of the underlying force fields. So, for example, the quanta of the electromagnetic field are ''[[photon]]s''. The strength of an electromagnetic field is dictated by the number of photons that make it up,  and the exchange of photons between particles with [[electric charge]] is the mechanism underlying the field's ability to exert an electromagnetic force upon these bodies.
===Leptons===
[[Lepton]]s are one ''type'' of fundamental particle. They have spin 1/2 and are ''not'' subject to the strong force. The known leptons are said to be of three ''families'' or ''generations'' (labeled in the table as ''1, 2, 3'') and of six ''flavors'', a generic term for the particle names. They are listed in the table below. Their antiparticles also are leptons with opposite [[electric charge]] ''Q'' and opposite Lepton number ''L<sub>e,&mu;,&tau;</sub>''.
{| class="wikitable" style="margin: 0 auto; text-align:center"
|+Lepton flavor properties
|-
! Particle name
! Symbol
! Family/Generation
! [[Electric charge|Q]] ([[elementary charge|e]])
! L<sub>e</sub>
! L<sub>μ</sub>
! L<sub>τ</sub>
! Mass (MeV)
! Lifetime ([[second|s]])


|-
==Science does not apply==
|style="text-align:left"| [[Electron]]
| ''e<sup>−</sup>''
| 1
| −1
| +1
| 0
| 0
| 0.510 998 928(11)<ref name=NISTe/>
| Stable


|-
One approach to limiting the applicability of science to our decisions is the examination of the notion of cause and effect.  For example, [[David Hume]] suggested that science did not really deal with causality, but with the correlation of events. So, for example, lighting a match in a certain environment does not ‘’cause’’ an explosion, but is ‘’associated’’ with an explosion.  [[Immanuel Kant]] suggested that the idea of cause and effect is not a fact of nature but an interpretation put on events by the human mind, a ‘programming’ built into our brains. Assuming this criticism to be true, there may exist classes of events that escape any attempt at cause and effect explanations.
|style="text-align:left"| [[Muon]]  
| ''&mu;<sup>−</sup>''
| 2
|−1
| 0
| +1
| 0
| 105.658 3715(35)<ref name=NISTmu/>
| 2.197019(21) × 10<sup>−6</sup>


|-
A different way to exempt human decision from the scientific viewpoint is to note that science is a human enterprise.  It involves the human creation of theories to explain certain observations, and moreover, the observations it chooses to attempt to explain are selected, and do not encompass all experience.  For example, we choose to explain phenomena like the [[Higgs boson]] found by elaborate means like a [[hadron collider]], but don’t attempt to explain other phenomena that do not appear amenable to science at this time, often suggesting that they are beneath attention.
|style="text-align:left"| [[Tau]]  
As time progresses, one may choose to believe that science will explain all experience, but that view must be regarded as speculation analogous to predicting the stock market on the basis of past performance.  
| ''&tau;<sup>−</sup>
| 3
| −1
| 0
| 0
| +1
| 1776.82(16)<ref name=NISTtau/>
| 2.906(10) × 10<sup>-13</sup>


|-
Although not explicitly addressing the issue of free will, it may be noted that [[Ludwig Wittgenstein]] argued that the specialized theories of science, as discussed by [[Rudolf Carnap]] for example, inevitably cover only a limited range of experience.  [[Stephen Hawking|Hawking/Mlodinow]] also noted this fact in in their [[model-dependent realism]],<ref name=Hawking/> the observation that, from the scientific viewpoint, reality is covered by a patchwork of theories that are sometimes disjoint and sometimes overlap.
|style="text-align:left"| [[Electron neutrino]]
{{quote|“Whatever might be the ultimate goals of some scientists, science, as it is currently practiced, depends on multiple overlapping descriptions of the world, each of which has a domain of applicability. In some cases this domain is very large, but in others quite small.”<ref name=Davies/>}}
| ''&nu;<sub>e</sub>''
::: —— E.B. Davies <span style="font-size:88%">''Epistemological pluralism'', p. 4</span>
| 1
| 0
| +1
| 0
| 0
| < 225 × 10<sup>−6</sup> <ref name=nuM/>
| Unknown


|-
Still another approach to this matter is analysis of the mind-brain connection (more generally, the [[mind-body problem]]). As suggested by Northoff,<ref name=Northoff/>  there is an observer-observation issue involved here. Observing a third-person’s mental activity is a matter for neuroscience, perhaps strictly a question of neurons and their interactions through complex networks.  But observing our own mental activity is not possible in this way – it is a matter of subjective experiences.  The suggestion has been made that ‘’complementary’’ descriptions of nature are involved, that may be simply different perspectives upon the same reality:
|style="text-align:left"| [[Muon neutrino]]
{{quote|“...for each individual there is ''one'' 'mental life' but ''two'' ways of knowing it: first-person knowledge and third-person knowledge. From a first-person perspective conscious experiences appear causally effective. From a third person perspective the same causal sequence can be explained in neural terms. It is not the case that the view from one perspective is right and the other wrong. These perspectives are complementary. The differences between how things appear from a first-person versus a third-person perspective has to do with differences in the ''observational arrangements'' (the means by which a subject and an external observer access the subject's mental processes).<ref name=Velmans/> |Max Velmans: |How could conscious experiences affect brains?,  p. 11''
| ''&nu;<sub>&mu;</sub>''
}}
| 2
| 0
| 0
| +1
| 0
| < 0.19 <ref name=nuM/>
| Unknown


|-
A related view is that the two descriptions may be mutually exclusive. That is, the connection between subjective experience and neuronal activity may run into a version of the measurement-observation interference noticed by [[Niels Bohr]] and by [[Erwin Schrödinger]] in the early days of quantum mechanics. (The measurement of the position of a particle caused the particle to change position in an unknown way.)
|style="text-align:left"| [[Tau neutrino]]  
{{quote|“...it is important to be clear about exactly what experience one wants one's subjects to introspect. Of course, explaining to subjects exactly what the experimenter wants them to experience can bring its own problems–...instructions to attend to a particular internally generated experience can easily alter both the timing and he content of that experience and even whether or not it is consciously experienced at all.<ref name=Pockett/> |Susan Pockett |The neuroscience of movement}}
| ''&nu;<sub>&tau;</sub>''
| 3
| 0
| 0
| 0
| +1
| < 18.2 <ref name=nuM/>
| Unknown


|}


===Quarks===
In any case, so far as free will is concerned, the implication of 'complementarity' is that 'free will' may be a description that is either an alternative to the scientific view, or possibly a view that can be entertained only if the scientific view is abandoned.
[[Quark]]s are a ''type'' of particle with spin 1/2 that are subject to strong, weak and electromagnetic forces. The known quarks are listed in the table below. The kinds of quark (''u, d, c, s, t, d'') are referred to as the ''flavor index'' of the quark, and besides a flavor index, each quark has a ''color index'', which may be any of three colors: red, green and blue (''r, g, b''). Their antiparticles also are quarks, but carry ''anti''-colors: anti-red, anti-green, anti-blue. Unlike a particle's electric charge, which can be any multiple of the elementary charge ''e'', a quark can carry only ''one'' unit of color.


{| class="wikitable" style="margin: 0 auto; text-align:center"
==Science can be accommodated==
|+'''Quark flavor properties'''
A second approach is to argue that we can accommodate our subjective notions of free will with a deterministic reality. One way to do this is to argue that although we cannot do differently, in fact we really don’t want to do differently, and so what we ‘decide’ to do always agrees with what we (in fact) have to do.  Our subjective vision of the decision process as ‘voluntary’ is just a conscious concomitant of the unconscious and predetermined move to action.
! Name
! Symbol
! Family/Generation
!width="50"|''B''
!width="50"|''[[Electric charge|Q]]''([[elementary charge|''e'']])
!width="50"|''I''
!width="50"|''C''
!width="50"|''S''
!width="50"|''T''
!width="50"|''B&prime;''
! Mass (MeV)
! Antiparticle
! Antiparticle symbol


|-
==’Will’ ''versus'' ‘action’==
| Up
There is growing evidence of the pervasive nature of subconscious thought upon our actions, and the capriciousness of consciousness,<ref name=Norretranders/> which may switch focus from a sip of coffee to the writing of a philosophical exposition without warning. There also is mounting evidence that our consciousness is greatly affected by events in the brain beyond our control. For example, [[addiction|drug addiction]] has been related to alteration of the mechanisms in the brain for [[dopamine]] production, and withdrawal from addiction requires a reprogramming of this mechanism that is more than a simple act of will. The ‘will’ to overcome addiction can become separated from the ability to execute that will.
| ''u''
{{quote|“Philosophers who distinguish ''freedom of action'' and ''freedom of will'' do so because our success in carrying out our ends depends in part on factors wholly beyond our control. Furthermore, there are always external constraints on the range of options we can meaningfully try to undertake. As the presence or absence of these conditions and constraints are not (usually) our responsibility, it is plausible that the central loci of our responsibility are our choices, or ‘willings’.”[Italics not in original.]<ref name=OConnor/>| Timothy O'Connor |Free Will}}
| 1
In effect, could the 'will' be a subjective perception which might operate outside the realm of scientific principle, while its execution is not?
| +1/3
| +2/3
| +1/2
| 0
| 0
| 0
| 0
| 2.34 ± 0.19 <ref name=quark/>
| Antiup
| ''ū''
|-
| Down
| ''d''
| 1
| +1/3
| −1/3
| −1/2
| 0
| 0
| 0
| 0
| 4.78 ± 0.11 <ref name=quark/>
| Antidown
| <math>\overline d</math>
|-
| Charm
| ''c''
| 2
| +1/3
| +2/3
| 0
| +1
| 0
| 0
| 0
| 1.294 ± 0.004 × 10<sup>3</sup> <ref name=quark/>
| Anticharm
| <math>\overline c</math>
|-
| Strange
| ''s''
| 2
| +1/3
| −1/3
| 0
| 0
| −1
| 0
| 0
| 100.2 ± 2.4<ref name=quark/>
| Antistrange
| <math>\overline s</math>
|-
| Top
| ''t''
| 3
| +1/3
| +2/3
| 0
| 0
| 0
| +1
| 0
| 172.9 ±0.6 ±0.9 × 10<sup>3</sup> <ref name=quark/>
| Antitop
| <math>\overline t</math>
|-
| Bottom
| ''b''
| 3
| +1/3
| −1/3
| 0
| 0
| 0
| 0
| −1
| 4.19 (+0.18) (−0.06) × 10<sup>3</sup> <ref name=quark/>
| Antibottom
| <math>\overline b</math>
|}
<small><center>''B'' = [[baryon number]], ''Q'' = [[electric charge]], ''I'' = [[isospin]], ''C'' = [[Charm (quantum number)|charm]], ''S'' = [[strangeness]], ''T'' = [[topness]], ''B''&prime; = [[bottomness]]. <br />* Notation such as ±''xxx'' denotes [[measurement uncertainty]]. In the case of the top quark, the first uncertainty is [[statistical error|statistical]] in nature, and the second is [[systematic error|systematic]].</center></small>


The quarks carry fractional electric charge. However, no quark has been observed in isolation, so a "free" fractional electric charge has not been seen. Another result of failure to observe an isolated quark is that the unit of color cannot be measured.
==Theology==
The ancient Greeks held the view that the gods ''could'' intervene in the course of events, and it was possible on occasion to divine their intentions or even to change them. That view leaves a role for free will, although it can be limited in scope by the gods. A more complete restriction is the belief that the gods are omniscient and have perfect foreknowledge of events, which obviously includes human decisions. This view leads to the belief that, while the gods know what we will choose, humans do not, and are faced therefore with playing the role of deciding our actions, even though they are scripted, a view contradicted by Cassius in arguing with Brutus, a Stoic:
{{quote| “The fault, dear Brutus, is not in our stars, But in ourselves, that we are underlings.”|spoken by Cassius| Julius Caesar (I, ii, 140-141)}}
The [[Stoicism|Stoics]] wrestled with this problem, and one argument for compatibility took the view that although the gods controlled matters, what they did was understandable using human intellect. Hence, when fate presented us with an issue, there was a duty to sort through a decision, and assent to it (a ''responsibility''), a sequence demanded by our natures as rational beings.<ref name=Bobzien/>


===Quanta===
In [http://www.iep.utm.edu/chrysipp/ Chrysippus of Soli's] view (an apologist for Stoicism), ''fate'' precipitates an event, but our nature determines its course, in the same way that bumping a cylinder or a cone causes it to move, but it rolls or it spins according to its nature.<ref name=Bobzien2/> The actual course of events depends upon the nature of the individual, who therefore bears a personal responsibility for the resulting events. It is not clear whether the individual is thought to have any control over their nature, or even whether this question has any bearing upon their responsibility.<ref name=Bobzien3/>
Because gravitation is not included in the standard model, there are three type of interaction included. Each type of interaction is mediated by exchange of quanta that are [[boson]]s, sometimes called ''messenger particles''.<ref name=Britannica/>
{| class="wikitable" style="margin: 0 auto; text-align:center"
|+Messenger particles
|-
! Interaction field
! Particle name
! Symbol
! Spin
! Range ([[metre (unit)|m]])
! Mass(GeV)
|-
|style="text-align:left"| [[Electromagnetism|Electromagnetic field]]
| Photon
| <span style="font-family: Times New Roman; font-size:120%; font-style:italic; font-weight:bold;"> γ </span>
| 1
| &infin;
| < 10<sup>−27</sup> <ref name=gammaM/>
|-
|style="text-align:left"| [[Weak field]]
| Weak bosons
| ''W<sup>+</sup>, W<sup>−</sup>, Z''
| 1
|  &asymp; 10<sup>−17</sup>
| ''M<sub>W</sub>''=80.399±0.023;<ref name=Wboson/> ''M<sub>Z</sub>''=91.1876±0.0021<ref name=Zboson/>
|-
|style="text-align:left"| [[Strong field]]  
| Gluons (8)
| ''g''
| 1
| &asymp; 10<sup>−15</sup>
| 0<ref name=gluonM/>
|-
|}
====Photons====
The photon mediates the electromagnetic force and has a very long history. It has neither electric charge nor mass.  


====Weak gauge bosons====
==References==
The massive ''W<sup>+</sup>, W<sup>−</sup>, Z'', weak bosons are the messenger particles for the weak force. Their nonzero mass is expected from the Standard Model because of the introduction of the ''[[Higgs boson]]'', a massive particle yet to be seen experimentally.  
{{reflist|refs=
<ref name=Bobzien>
{{cite book |author=Susanne Bobzien |title=Determinism and Freedom in Stoic Philosophy |url=http://books.google.com/books?id=7kmTeOjHIqkC&printsec=frontcover |year=1998 |publisher=Oxford University Press |isbn=0198237944}} See §6.3.3 ''The cylinder and cone analogy'', pp. 258 ''ff''.  
</ref>


====Gluons====
<ref name=Bobzien2>
A gluon carries both a color and an anti-color. When a quark emits a gluon, its color changes in a way dependent upon the color/anti-color of the emitted gluon. For example, a red quark can emit a red-antiblue gluon, becoming a blue quark. There are nine possible color-anticolor combinations of ''r, g, b'', which leads to only eight possible gluons because emission by a quark of one color-anticolor combination (<math>r\overline r + g \overline g + b \overline b </math>) doesn't change the state of a quark and cannot act as a messenger.<ref name=Boyarkin/> The remaining eight gluon color combinations are shown below.<ref name=Watson/>
{{cite book |author=Susanne Bobzien |title=Determinism and Freedom in Stoic Philosophy |url=http://books.google.com/books?id=7kmTeOjHIqkC&printsec=frontcover |year=1998 |publisher=Oxford University Press |isbn=0198237944}} See in particular pp. 386 ''ff''.  
{| class="wikitable" style="margin: 0 auto; text-align:center"
</ref>
|+Gluon color combinations


|-
<ref name=Bobzien3>
|style="text-align:left"| <math>r\overline g </math>
{{cite book |author=Susanne Bobzien |title=Determinism and Freedom in Stoic Philosophy |url=http://books.google.com/books?id=7kmTeOjHIqkC&printsec=frontcover |year=1998 |publisher=Oxford University Press |isbn=0198237944}} See in particular p. 255.
| style="text-align:left"|<math>g\overline b </math>
</ref>
| style="text-align:left"|<math>b\overline r </math>
| <math>\frac{1}{\sqrt{6}}\left(r\overline r+g\overline g -2 b\overline b \right) </math>
|-
| style="text-align:left"|<math>g\overline r </math>
| style="text-align:left"|<math>b\overline g </math>
| style="text-align:left"|<math>r\overline b </math>
| <math>\frac{1}{\sqrt{2}}\left(r\overline r-g\overline g \right) </math>
|-


|}


==References==
<ref name=Davies>
{{Reflist|refs=
{{cite web |title=Epistemological pluralism |author=E Brian Davies |url=http://philsci-archive.pitt.edu/3083/1/EP3single.doc |work=PhilSci Archive |year=2006 }}
<ref name=Boyarkin>
{{cite book |title=Introduction to Physics of Elementary Particles |author=O. M. Boyarkin, Alfred L. Heinzerton |url=http://books.google.com/books?id=WFDs_SJgILQC&pg=PA2 |pages=p. 2 |isbn=160021200X |year=2007 |publisher=Nova Publishers}}
</ref>
</ref>


<ref name=Britannica>
{{cite book |author=Britannica Educational Publishing |title=The Britannica Guide to Particle Physics |isbn=1615303820 |publisher=The Rosen Publishing Group |year=2011 |pages=p. 15 |url=http://books.google.com/books?id=NJP22nPwnRoC&pg=PA15 |chapter=The basic forces and their messenger particles |editor=Erik Gregersen, ed}}
</ref>


<ref name=gammaM>
<ref name=Hawking>
{{cite web |url=http://pdg.lbl.gov/2011/listings/rpp2011-list-photon.pdf |title=&gamma; |work=PDG Particle listings  |author=K. Nakamura ''et al.'' |publisher=Particle Data Group |date=June 16, 2011 }}
{{cite book |author=Hawking SW, Mlodinow L. |title=The Grand Design |isbn=0553805371 |url= http://www.amazon.com/Grand-Design-Stephen-Hawking/dp/0553805371#reader_0553805371 |pages=pp. 42-43 |chapter=Chapter 3: What is reality?|year=2010|publisher=Bantam Books}}
</ref>
</ref>


<ref name=gluonM>
<ref name=Norretranders>
{{cite web |url=http://pdg.lbl.gov/2011/listings/rpp2011-list-gluon.pdf |title=g or gluon |work=PDG Particle listings  |author=K. Nakamura ''et al.'' |publisher=Particle Data Group |date=June 16, 2011 }}
{{cite book |url=http://www.google.com/search?tbo=p&tbm=bks&q=consciousness%2Bplays%2Ba%2Bsmaller%2Brole%2Bin%2Bhuman%2Blife+intitle:User+intitle:illusion&num=10 |title=The user illusion: Cutting consciousness down to size |quote=Consciousness plays a far smaller role in human life than Western culture has tended to believe |author=Tor Nørretranders |isbn=0140230122 |chapter=Preface |pages=p. ''ix'' |publisher=Penguin Books |year=1998 |edition=Jonathan Sydenham translation of ''Maerk verden'' 1991 ed }}
</ref>
</ref>


<ref name=NISTe>
<ref name=Ney>
{{cite web |url=http://physics.nist.gov/cgi-bin/cuu/Value?mec2|search_for=atomnuc! |title=Electron mass energy equivalent in MeV ''m<sub>e</sub>c<sub>0</sub><sup>2</sup>'' |publisher=NIST |accessdate=2011-08-26}}
{{cite web |author=Alyssa Ney |title=Reductionism |work=Internet Encyclopedia of Philosophy |date= November 10, 2008 |url=http://www.iep.utm.edu/red-ism/}}
</ref>
</ref>


 
<ref name=Northoff>
<ref name=NISTmu>
A rather extended discussion is provided in {{cite book |title=Philosophy of the Brain: The Brain Problem |author=Georg Northoff |url=http://books.google.com/books?id=r0Bf3lLys6AC&printsec=frontcover |publisher=John Benjamins Publishing |isbn=1588114171 |year=2004 |edition=Volume 52 of Advances in Consciousness Research}}
{{cite web |url=http://physics.nist.gov/cgi-bin/cuu/Value?mec2|search_for=atomnuc! |title=Muon mass energy equivalent in MeV ''m<sub>&mu;</sub>c<sub>0</sub><sup>2</sup>''|publisher=NIST|accessdate=2011-08-26}}
</ref>
</ref>


<ref name=NISTtau>
<ref name=OConnor>
{{cite web |url=http://physics.nist.gov/cgi-bin/cuu/Value?mec2|search_for=atomnuc!|title=Tau mass energy equivalent in MeV ''m<sub>&tau;</sub>c<sub>0</sub><sup>2</sup>''|publisher=NIST|accessdate=2011-08-26}}
{{cite web |title=&thinsp;Free Will |date=Oct 29, 2010 |author=O'Connor, Timothy |url=http://plato.stanford.edu/archives/sum2011/entries/freewill |work=The Stanford Encyclopedia of Philosophy (Summer 2011 Edition) |editor=Edward N. Zalta, ed.}}
</ref>
</ref>


<ref name=nuM>
<ref name=Pockett>
{{cite web |url=http://pdg.lbl.gov/2011/listings/rpp2011-list-neutrino-prop.pdf |title=Neutrino properties |work=PDG Particle listings  |author=K. Nakamura ''et al.'' |publisher=Particle Data Group |date=June 16, 2011 }}
{{cite book|title=&thinsp;Does Consciousness Cause Behavior? |chapter=The neuroscience of movement |author=Susan Pockett |url=http://books.google.com/books?id=G5CaTnNksgkC&pg=PA19&lpg=PA19 |pages= p. 19 |editor=Susan Pockett, WP Banks, Shaun Gallagher, eds. |publisher=MIT Press |date =2009 |isbn=0262512572}}
</ref>
</ref>


<ref name=quark>
<ref name=Timpe>
{{cite web |url=http://pdg.lbl.gov/2011/listings/contents_listings.html |title=QUARKS |work=PDG Particle listings  |author=K. Nakamura ''et al.'' |publisher=Particle Data Group |date=January 15, 2011 }}
{{cite web |author=Kevin Timpe |title=Free will |work=Internet Encyclopedia of Philosophy |date= March 31, 2006 |url=http://www.iep.utm.edu/freewill/#H5}}
</ref>
</ref>


<ref name=Watson>
{{cite book |title=The quantum quark |author=Andrew Watson |chapter=Table 4.4: The eight gluon color configurations |pages=p. 175 |url=http://books.google.com/books?id=ip50x8IOfnEC&pg=PA175 |isbn=0521829070 |publisher=Cambridge University Press |year=2004}}
</ref>


<ref name=Wboson>
<ref name=Velmans>
{{cite web |url=http://pdg.lbl.gov/2011/listings/rpp2011-list-w-boson.pdf |title=W |work=PDG Particle listings  |author=K. Nakamura ''et al.'' |publisher=Particle Data Group |date=June 16, 2011 }}
{{cite journal |journal=Journal of Consciousness Studies |volume=9 |issue=11 |year=2002 |pages=pp. 2-29 |author=Max Velmans  |title=How Could Conscious Experiences Affect Brains? |url=http://cogprints.org/2750/ |year=2002}}
</ref>
</ref>


<ref name=Zboson>
<ref name=Vihvelin>
{{cite web |url=http://pdg.lbl.gov/2011/listings/rpp2011-list-z-boson.pdf |title=Z |work=PDG Particle listings  |author=K. Nakamura ''et al.'' |publisher=Particle Data Group |date=June 16, 2011 }}
{{cite web |author=Kadri Vihvelin |title=&thinsp;Arguments for Incompatibilism |work=The Stanford Encyclopedia of Philosophy (Spring 2011 Edition) |editor=Edward N. Zalta, ed. |url= http://plato.stanford.edu/archives/spr2011/entries/incompatibilism-arguments/ |date=Mar 1, 2011}}
</ref>
</ref>


}}
}}
[http://www.ncnr.nist.gov/summerschool/ss09/pdf/Gardner_FP09_01.pdf NIST]
[http://books.google.com/books?id=wJUDIBstnMQC&pg=PA36&dq=gluon+mass&hl=en&ei=a6JbTrrzMJDUiAL__tm5CQ&sa=X&oi=book_result&ct=result&resnum=4&ved=0CDoQ6AEwAw#v=onepage&q=gluon%20mass&f=false McParland]

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In philosophy the term free will refers to consideration of whether an individual has the ability to make decisions or, alternatively, has only the illusion of doing so. It is an age-old concern to separate what we can do something about, choose to do, from what we cannot. The underlying quandary is the idea that science suggests future events are dictated to a great extent, and perhaps entirely, by past events and, inasmuch as the human body is part of the world science describes, its actions also are determined by physical laws and are not affected by human decisions. This view of events is a particular form of determinism, sometimes called physical reductionism,[1] and the view that determinism precludes free will is called incompatibilism.[2]

There are several ways to avoid the incompatibilst position, resulting in various compatibilist positions.[3] One is to limit the scope of scientific description in a manner that excludes human decisions. Another is to argue that even if our actions are strictly determined by the past, it doesn’t seem that way to us, and so we have to find an approach to this issue that somehow marries our intuition of independence with the reality of its fictional nature. A third, somewhat legalistic approach, is to suggest that the ‘will’ to do something is quite different from actually doing it, so ‘free will’ can exist even though there may be no freedom of action.

There is also a theological version of the dilemma. roughly, if a deity or deities, or 'fate', controls our destiny, what place is left for free will?

Science does not apply

One approach to limiting the applicability of science to our decisions is the examination of the notion of cause and effect. For example, David Hume suggested that science did not really deal with causality, but with the correlation of events. So, for example, lighting a match in a certain environment does not ‘’cause’’ an explosion, but is ‘’associated’’ with an explosion. Immanuel Kant suggested that the idea of cause and effect is not a fact of nature but an interpretation put on events by the human mind, a ‘programming’ built into our brains. Assuming this criticism to be true, there may exist classes of events that escape any attempt at cause and effect explanations.

A different way to exempt human decision from the scientific viewpoint is to note that science is a human enterprise. It involves the human creation of theories to explain certain observations, and moreover, the observations it chooses to attempt to explain are selected, and do not encompass all experience. For example, we choose to explain phenomena like the Higgs boson found by elaborate means like a hadron collider, but don’t attempt to explain other phenomena that do not appear amenable to science at this time, often suggesting that they are beneath attention. As time progresses, one may choose to believe that science will explain all experience, but that view must be regarded as speculation analogous to predicting the stock market on the basis of past performance.

Although not explicitly addressing the issue of free will, it may be noted that Ludwig Wittgenstein argued that the specialized theories of science, as discussed by Rudolf Carnap for example, inevitably cover only a limited range of experience. Hawking/Mlodinow also noted this fact in in their model-dependent realism,[4] the observation that, from the scientific viewpoint, reality is covered by a patchwork of theories that are sometimes disjoint and sometimes overlap.

“Whatever might be the ultimate goals of some scientists, science, as it is currently practiced, depends on multiple overlapping descriptions of the world, each of which has a domain of applicability. In some cases this domain is very large, but in others quite small.”[5]
—— E.B. Davies Epistemological pluralism, p. 4

Still another approach to this matter is analysis of the mind-brain connection (more generally, the mind-body problem). As suggested by Northoff,[6] there is an observer-observation issue involved here. Observing a third-person’s mental activity is a matter for neuroscience, perhaps strictly a question of neurons and their interactions through complex networks. But observing our own mental activity is not possible in this way – it is a matter of subjective experiences. The suggestion has been made that ‘’complementary’’ descriptions of nature are involved, that may be simply different perspectives upon the same reality:

“...for each individual there is one 'mental life' but two ways of knowing it: first-person knowledge and third-person knowledge. From a first-person perspective conscious experiences appear causally effective. From a third person perspective the same causal sequence can be explained in neural terms. It is not the case that the view from one perspective is right and the other wrong. These perspectives are complementary. The differences between how things appear from a first-person versus a third-person perspective has to do with differences in the observational arrangements (the means by which a subject and an external observer access the subject's mental processes).”[7]

—Max Velmans: , How could conscious experiences affect brains?, p. 11

A related view is that the two descriptions may be mutually exclusive. That is, the connection between subjective experience and neuronal activity may run into a version of the measurement-observation interference noticed by Niels Bohr and by Erwin Schrödinger in the early days of quantum mechanics. (The measurement of the position of a particle caused the particle to change position in an unknown way.)

“...it is important to be clear about exactly what experience one wants one's subjects to introspect. Of course, explaining to subjects exactly what the experimenter wants them to experience can bring its own problems–...instructions to attend to a particular internally generated experience can easily alter both the timing and he content of that experience and even whether or not it is consciously experienced at all.”[8]

—Susan Pockett , The neuroscience of movement


In any case, so far as free will is concerned, the implication of 'complementarity' is that 'free will' may be a description that is either an alternative to the scientific view, or possibly a view that can be entertained only if the scientific view is abandoned.

Science can be accommodated

A second approach is to argue that we can accommodate our subjective notions of free will with a deterministic reality. One way to do this is to argue that although we cannot do differently, in fact we really don’t want to do differently, and so what we ‘decide’ to do always agrees with what we (in fact) have to do. Our subjective vision of the decision process as ‘voluntary’ is just a conscious concomitant of the unconscious and predetermined move to action.

’Will’ versus ‘action’

There is growing evidence of the pervasive nature of subconscious thought upon our actions, and the capriciousness of consciousness,[9] which may switch focus from a sip of coffee to the writing of a philosophical exposition without warning. There also is mounting evidence that our consciousness is greatly affected by events in the brain beyond our control. For example, drug addiction has been related to alteration of the mechanisms in the brain for dopamine production, and withdrawal from addiction requires a reprogramming of this mechanism that is more than a simple act of will. The ‘will’ to overcome addiction can become separated from the ability to execute that will.

“Philosophers who distinguish freedom of action and freedom of will do so because our success in carrying out our ends depends in part on factors wholly beyond our control. Furthermore, there are always external constraints on the range of options we can meaningfully try to undertake. As the presence or absence of these conditions and constraints are not (usually) our responsibility, it is plausible that the central loci of our responsibility are our choices, or ‘willings’.”[Italics not in original.][10]

— Timothy O'Connor , Free Will

In effect, could the 'will' be a subjective perception which might operate outside the realm of scientific principle, while its execution is not?

Theology

The ancient Greeks held the view that the gods could intervene in the course of events, and it was possible on occasion to divine their intentions or even to change them. That view leaves a role for free will, although it can be limited in scope by the gods. A more complete restriction is the belief that the gods are omniscient and have perfect foreknowledge of events, which obviously includes human decisions. This view leads to the belief that, while the gods know what we will choose, humans do not, and are faced therefore with playing the role of deciding our actions, even though they are scripted, a view contradicted by Cassius in arguing with Brutus, a Stoic:

“The fault, dear Brutus, is not in our stars, But in ourselves, that we are underlings.”

—spoken by Cassius, Julius Caesar (I, ii, 140-141)

The Stoics wrestled with this problem, and one argument for compatibility took the view that although the gods controlled matters, what they did was understandable using human intellect. Hence, when fate presented us with an issue, there was a duty to sort through a decision, and assent to it (a responsibility), a sequence demanded by our natures as rational beings.[11]

In Chrysippus of Soli's view (an apologist for Stoicism), fate precipitates an event, but our nature determines its course, in the same way that bumping a cylinder or a cone causes it to move, but it rolls or it spins according to its nature.[12] The actual course of events depends upon the nature of the individual, who therefore bears a personal responsibility for the resulting events. It is not clear whether the individual is thought to have any control over their nature, or even whether this question has any bearing upon their responsibility.[13]

References

  1. Alyssa Ney (November 10, 2008). Reductionism. Internet Encyclopedia of Philosophy.
  2. Kadri Vihvelin (Mar 1, 2011). Edward N. Zalta, ed.: Arguments for Incompatibilism. The Stanford Encyclopedia of Philosophy (Spring 2011 Edition).
  3. Kevin Timpe (March 31, 2006). Free will. Internet Encyclopedia of Philosophy.
  4. Hawking SW, Mlodinow L. (2010). “Chapter 3: What is reality?”, The Grand Design. Bantam Books, pp. 42-43. ISBN 0553805371. 
  5. E Brian Davies (2006). Epistemological pluralism. PhilSci Archive.
  6. A rather extended discussion is provided in Georg Northoff (2004). Philosophy of the Brain: The Brain Problem, Volume 52 of Advances in Consciousness Research. John Benjamins Publishing. ISBN 1588114171. 
  7. Max Velmans (2002). "How Could Conscious Experiences Affect Brains?". Journal of Consciousness Studies 9 (11): pp. 2-29.
  8. Susan Pockett (2009). “The neuroscience of movement”, Susan Pockett, WP Banks, Shaun Gallagher, eds.:  Does Consciousness Cause Behavior?. MIT Press, p. 19. ISBN 0262512572. 
  9. Tor Nørretranders (1998). “Preface”, The user illusion: Cutting consciousness down to size, Jonathan Sydenham translation of Maerk verden 1991 ed. Penguin Books, p. ix. ISBN 0140230122. “Consciousness plays a far smaller role in human life than Western culture has tended to believe” 
  10. O'Connor, Timothy (Oct 29, 2010). Edward N. Zalta, ed.: Free Will. The Stanford Encyclopedia of Philosophy (Summer 2011 Edition).
  11. Susanne Bobzien (1998). Determinism and Freedom in Stoic Philosophy. Oxford University Press. ISBN 0198237944.  See §6.3.3 The cylinder and cone analogy, pp. 258 ff.
  12. Susanne Bobzien (1998). Determinism and Freedom in Stoic Philosophy. Oxford University Press. ISBN 0198237944.  See in particular pp. 386 ff.
  13. Susanne Bobzien (1998). Determinism and Freedom in Stoic Philosophy. Oxford University Press. ISBN 0198237944.  See in particular p. 255.