How physicists handle the idea of Free Will?

[fbs7]

Even if we propose there was some sort of quantum randomness how does that bring back "free will"? If anything that's less free.

Interestingly (for me, at least), while researching the answers that have been posted in this thread, I found this short discussion from professor Michio Kaku

http://www.youtube.com/watch?v=lFLR5vNKiSw

I think his point of view is quite interestingly. If I understood it right, he calls Determinism the concept that the universe is a "gigantic clock", so someone's acts now are predisposed from what happened a million years ago.

But, against that, you have quantum uncertainty, what means that you cannot predict something completely based on a past state - there is always uncertainty, the "wild card". Therefore someone's thinking is unpredictable at some level, and that level of unpredictability is free will.

Therefore, if he's right then it would seem to me that free will versus determinism is the wrong question. The right question is free will versus indeterminism from quantum mechanics.

Also, I wish I understood it better the concept of the Quantum Brain. I'm not sure if that theory is related to this or not.

 

[James Leighe]

Just because you can't predict your actions doesn't mean they are free will, which is an important point made early on.

But in reality, unless you set up some kind of special case, the brain is too large to even be effected by quantum 'randomness'.

 

[Zarqon]

That's a good question, and I bet every person will have a different answer. I think this one from Merriam-Webster reflects my thinking:

free will (noun)
1. ..
2. freedom of humans to make choices that are not determined by prior causes or by divine intervention

I've been thinking on and off about free will for a few years now, and I've come to the conclusion that the biggest problem in dealing with this question is really to define "free will" in the first place. In Merriam-Websters definition for example, it all falls on the word "choice" which is not well defined(*). If you don't include the word choice, then you get simply "an action that is not determined by prior causes or divine intervention", which may just as well be the definition of total randomness.

A huge problem with defining free will is that it falls down to two different opposites:

1) the brain is deterministic, and while this might be consider as "will" it certainly isn't "free", thus there is no free will.

2) the brain acts from randomness, while this makes your choices "free", most people do no consider this as "will", and thus there is no free will.My best explanation for the notion of "free will", is that it is a collection of algorithms and filters in your brain that are based on information from your past gathered experience + genetics + immediate sensory input, in order to arrive at a "choice". The reason why it feels like the choices you make are out of a free will, is that you may not directly be aware of most filters/algorithms in your brain, since there are so many of them, and they all contribute/interact in subtle ways to help you "make the decision".

In addition to that, I think there is some amount of randomness/unpredictability involved in making choices. This may not stem from quantum randomness, but may simply come from the fact that most sufficiently complicated processes demonstrate some form of chaotic behavior, which gives unpredictability. And your brain is most certainly complicated enough for this.

*) for example, Merriam-Websters defines choice as "the act of choosing" which is a rather useless definition in this context.

 

[fbs7]

I think that's a great summarization, Zargon.

Thanks all for the great inputs!

 

[sophiecentaur]

Free will goes along with consciousness. We are only 'conscious' of having made a decision long after it's been made (hundreds of ms delay) so why get hung up as to whether you have any responsibility for the decision? Your brain got on and decided without your conscious help anyway. All you can do, rationally ist to justify it post hoc.

 

[Ryan_m_b]

Free will goes along with consciousness. We are only 'conscious' of having made a decision long after it's been made (hundreds of ms delay) so why get hung up as to whether you have any responsibility for the decision? Your brain got on and decided without your conscious help anyway. All you can do, rationally ist to justify it post hoc.

This hasn't been 100% confirmed but there is evidence to indicate that you are right and consciousness is actually a by product of subconscious actions i.e. "choice" is an illusion because consciousness is more like a commentary of what is going on rather than a decision making agent.
http://en.wikipedia.org/wiki/Epiphenomenalism#Arguments_for

 

[sophiecentaur]

I like to view my consciousness at the 'chairman of the board' presenting board decisions to the world and justifying them. He gets all the glory and more pay than anyone else.

 

[daveb]

And yet the subconscious gets the blame...seems a little lopsided to me

 

[sophiecentaur]

That's life my boy.

 

[Goodison_Lad]

so why get hung up as to whether you have any responsibility for the decision? Your brain got on and decided without your conscious help anyway. All you can do, rationally ist to justify it post hoc.

Logically, then, is Zargon free to do anything at all, even post-hoc rationalisation. It'll either happen or it won't. Even wanting it to happen must be uncontrollable.

 

[Evo]

This doesn't belong in physics. Moved.

 

[Pythagorean]

Thanks for that

Hmm I'm still not clear of how this would "keep free will" but more than that I could in principle track the effects of a neuron back to the point where what it has done has contributed to its future behaviour (i.e. the firing of neuron A inhibits neuron B which excites neuron C which excites neuron A. A then fires and the firing of A...).

Either way though I feel like we're straying from the OP's question about free will. Unless someone has something to say regarding the OPs definition of free will and what science has to say about it we're done here.

I agree with Ryan. Free will really has no rational definition that's of use to a model where causality is involved. The only place we can show downward causation is in the cases of weak downward causation; like the coupling effects between water molecules make a body we call water and the body as a whole has effects down on to water molecules. But there is no causality trick here; the system can be defined in terms of the participating elements (water molecules) and the coupling between them.

And I also agree with Doc Al that a random event would be equivalently useless to the idea of free will. Thus, free will is a supernatural idea.

I think some people might be confusing free will with willpower. Willpower is the ability for an organism to do what it wants to do despite its own (or external) challenges. But free will is about whether the organism really ever chose its wants.

 

[Kholdstare]

Imagination in straitjacket
https://www.youtube.com/watch?v=ysYEAC4z66c

 

[Khashishi]

I think the answer is, if you have to ask what free will means, then you don't believe in it. Free will exists only as a gap in our knowledge.

 

[Goodison_Lad]

Well, going back to the OP question, there seems to me to be a simple choice:

a) accept physics in its present form as a complete description of all that is, in which case you must accept free will is impossible according to physics and is merely an illusion

or

b) accept the existence of free will, thereby accepting that physics in its present form is not a complete description of all that is.

I don't think it's provable either way, despite what either side of the debate might say.

I guess most physicists would opt for (a) professionally (but probably run their personal lives as though b were the anwser). If (a) were true, perhaps biology might account for it. Natural selection is frequently invoked to account for a biological phenomenon in terms of the survival/selective advantage the phenomenon conveys. What, I wonder, would be the evolutionary advantage of the illusion of a non-existent free will?

(I choose b - or is it just an illusion that I chose it?)

 

[Gokul43201]

Would one of the people that understands what free will is please describe a thought experiment that determines whether or not free will is being exercised in some chosen situation?

 

[Maui]

Would one of the people that understands what free will is please describe a thought experiment that determines whether or not free will is being exercised in some chosen situation?

People who go on hunger strike and starve to death fighting for a (higher) cause or principle. People who commit suicide over injustice or emotional pain.

Can the interaction between these elements that make up the human body produce emotional pain(why would they care?):

oxygen
carbon
hydrogen
nitrogen
calcium
phosphorus
potassium
sulfur
sodium
chlorine
magnesium
iron
fluorine
zinc
silicon
rubidium
strontium
bromine
lead
copper
aluminum
cadmium
cerium
barium
iodine
tin
titanium
boron
nickel
selenium
chromium
manganese
arsenic
lithium
cesium
mercury
germanium
molybdenum
cobalt
antimony
silver
niobium
zirconium
lanthanium
gallium
tellurium
yttrium
bismuth
thallium
indium
gold
antalum
vanadium
thorium
uranium
samarium
beryllium
tungsten

Elements referred above were taken from here:

http://web2.iadfw.net/uthman/elements_of_body.html

 

[apeiron]

I like to view my consciousness at the 'chairman of the board' presenting board decisions to the world and justifying them. He gets all the glory and more pay than anyone else.

Not a bad analogy as consciousness - or attentional level processing - is there to set the directions rather than sweat the detail.

But what people seem to be missing is that this happens before the action too. The mind works in anticipatory fashion (as made explicit in modern theory, such as the "bayesian brain" model).

So like a board, at an attentive level you form the goals and expectations. You produce a context in which certain things are predicted and habitual/automatic level responses are permitted. Then afterwards, back at the board level, you get to assess and make strategic changes.

The "freewill" experiments everyone talks about - Libet's mostly - are widely misinterpreted because the subjects are quite conscious beforehand of the way they are expected to perform the task. They are mentally prepared in a specific "hands off" state. The chairman of the board has basically said I want my finger to twitch, but I don't want to give a specific order on the moment it happens.

So part of the task demand is a few moments of suitable delay where the subject is in fact consciously thinking "I'm not thinking about making it happen, it's just going to happen, and it hasn't happened yet so I'm doing it right - oh it just happened, and so I've now done what was asked."

 

[josh1492]

Can you give an example of making a choice not determined by prior causes. Not sure what that would mean.

we had this discussion in class and the teacher rebutted this perspective with the idea that I can choose to do some seemingly arbitrary/random action such as clap my hands or jump up and down that is not based upon past experience...meaning that there is the possibility of completing an action for its own sake. Like making a conscious effort to break from a routine and selecting an action.

When you get into the realm of trying to choose actions based upon desired outcomes it is easier to argue that your actions are pre-determined based upon past experience or the current environmental state but even then its not absolutely so. A good example of this is when you have multiple courses to choose from that will all result in the acquisition of a desired result. Those choices are pre-selected(pre-determined) based upon the past but it is your choice, which, if any, action you choose to obtain the end result.

 

[josh1492]

(I choose b - or is it just an illusion that I chose it?)

lol... you didnt really choose B you just think you made a free will choice to choose B your choice was really pre-determined based upon the input you received much like the way that a computer displays the character "B" when I hold down shift and press the "b" key...

trying to be sarcastic...but i find it interesting how such mundane things can become so complex when applied to a philosophical filter.

 

[josh1492]

Free-will is free because you, through the assertion of willpower, can choose(free), using your own mind ,to change the way that you think. For example... I can sit here in my room and shut off the lights and play a loud white noise and think about things in a manner that I choose until my thought processes change. Through my own independent free will actions I have affected all future thought processes and through this process I have exerted a continuation of my free will. Buddhism is a good example of how people use their own mental faculties to change their minds...but we all do it everyday...all day long and when you don't consciously do it but rather just respond to your environment you can fall into a pattern that makes free-will seem as if it is an impossibility.

 

[Credulous]

The way I see it, free will is when Joan d'Arc chose to be burned instead of saving herself by reneging her beliefs. The way I see it, it was her choice.

This is the way I see it: How do we know that Joan "chose" to be burnt at the stake? Well for one we know she told whoever was persecuting her that she would rather be burned at the stake than change her faith. And to tell them she had to open her mouth, inhale, and then exhale while moving the jaw and tongue to manipulate the sounds coming from her vocal chords. And this all happens within a known proces: the brain hears the question ("will you renounce your faith?") via an electrical signal coming down the nerves of the ears, which hits the nerves of the brain, firing off a chain reaction of signals that, through their wiring, end up sending signals down to the lungs, jaw and tongue to formulate the proper response.

Now at what point did free will come in there? Are we inhabited by some kind of ethreal being who somehow modifies that path of this electrical signal? Probably not, the brain simply obeys the laws of physics (which are indeterminate, not determinate actually) and spits out a response.

What would free will mean in this context? How would one be making a response that was "yours"?

 

[josh1492]

This is the way I see it: How do we know that Joan "chose" to be burnt at the stake? Well for one we know she told whoever was persecuting her that she would rather be burned at the stake than change her faith. And to tell them she had to open her mouth, inhale, and then exhale while moving the jaw and tongue to manipulate the sounds coming from her vocal chords. And this all happens within a known proces: the brain hears the question ("will you renounce your faith?") via an electrical signal coming down the nerves of the ears, which hits the nerves of the brain, firing off a chain reaction of signals that, through their wiring, end up sending signals down to the lungs, jaw and tongue to formulate the proper response.

Now at what point did free will come in there? Are we inhabited by some kind of ethreal being who somehow modifies that path of this electrical signal? Probably not, the brain simply obeys the laws of physics (which are indeterminate, not determinate actually) and spits out a response.

What would free will mean in this context? How would one be making a response that was "yours"?

If i am understanding you correctly you are stating that just because we use our brains to achieve an end result and we cannot achieve the end result without our brains it means that freewill does not exist.

free will comes into play when a choice is made. By choosing and making a determination which then influences future determinations causing a snowball effect...in essence we are always exerting our free will. The factors that one chooses to accept or to ignore are what effect our determinations...and only then if we choose to allow them to. It sounds like, from what you are saying, we have no control over what thoughts we think and if we do its only an illusion of control. If this were true we would not have conscious thought. We would only be organic machines. Maybe this argument holds true for animals but for humans I really don't think so...even though both humans and animals live in the same world governed by the same principal elements.

 

[Goodison_Lad]

How do we know that Joan "chose" to be burnt at the stake? ...Are we inhabited by some kind of ethreal being who somehow modifies that path of this electrical signal? Probably not, the brain simply obeys the laws of physics (which are indeterminate, not determinate actually) and spits out a response.

If the brain really is a machine that inexorably follows the laws of physics, and nothing else, its outputs are, as you say, dictated by those laws and nothing else. There is no room at all for free will in the sense that most people would understand it i.e. could the action of the person have been anything different? As has been pointed out elsewhere, even quantum mechanics doesn’t solve the riddle. The fact that the outcomes of quantum processes are ultimately unpredictable other than on a probabilistic level is still the laws of physics but with what appears to be an element of randomness. Even if free will were somehow tied to this randomness (and there is absolutely no evidence yet that it is), it would not be ‘free’ – it would just be unpredictable. I think this is essentially the materialist view.

The materialist view is based on the assumption, rarely stated explicitly, that every recognised phenomenon is ultimately reducible to the laws of physics. (Accepting the assumption is even considered by many to be a necessary condition for a person to be considered rational: so, by this definition, if you don’t subscribe to the materialist assumption, you can’t be truly rational.) But it is an assumption, and it has certainly not been proved to my knowledge. Is it even testable scientifically? Probably not, by definition.

Materialist arguments against ‘ethereal beings’ etc. (such as how could a non-physical agency possibly affect a physical process?) are, therefore, based on the materialist assumption. So for any phenomenon, the conclusion reached is that no matter how inexplicable it seems to be at present according to physics, it still must necessarily be the result of physics. This is what particle physicist and Anglican theologian called promissory materialism. More often, however, the existence of many phenomena is simply denied and do not require explanation, due to them appearing to lie outside physical law – if phenomena can’t be demonstrated scientifically, they don’t exist – another manifestation of the assumption.

So if the materialist assumption is correct, it seems there can be no free will, and therefore any feeling that there is free will must be an ‘illusion’, which will eventually be accounted for. I think the decision is between promissory materialism or something else.

However, this generates a second question: who is being fooled by this illusion? There seems at this point to be a separation between the conscious awareness of what's going on in our minds and the products being served up by the mechanical brain – the brain as the ‘stage magician’ and our consciousness as the audience. It is possible to conceive of brain process as mechanistic, but where did the audience of consciousness come from? Is it, too, merely a consequence of the mechanical brain, as it must be if the materialist view is true?

I feel another thread coming on!

 

[Pythagorean]

The materialist view is based on the assumption, rarely stated explicitly, that every recognised phenomenon is ultimately reducible to the laws of physics.

It's actually quite explicitly stated by the new terms for materialist (because "materialist" invites irrelevant arguments. It implies only matter; not energy or information, which are also physical properties.

The new term is physicalism:
http://en.wikipedia.org/wiki/Physicalism

 

[chingel]

But what else could happen other than electrical signals going through the complex network of neurons? All the responses don't have to be predetermined and you can "make a decision", but that is just running information through very complex system of "logic gates", along with plenty of random or coincidental factors like mood and so on.

It's like if you make a computer play a video game like GTA, not using a predetermined list of moves and actions, but giving it some basic ability to analyze and a basic urges. You make it analyze the environment, search around, look for things, try different things, hardwire such seeking behavior in. Would you say the program has free will? The specific action wasn't predetermined, but it just wandered around to a specific place, made a decision due to maybe some cues from the environment and a hardwired curiosity, seems like free will or not? Then make the program very complicated, make its mood swing, give it a very good ability to analyze, learn, remember, seek patterns, make it fear some things, want some things, like some things, give it moral values, empathy, make it able to change its likings and wishes somewhat rationally to achieve a goal, somewhat randomly etc. Then you have a complicated program, making "decisions" where and how to go and what to do. Would that be called free will?

 

[Goodison_Lad]

It's actually quite explicitly stated by the new terms for materialist (because "materialist" invites irrelevant arguments. It implies only matter; not energy or information, which are also physical properties.

The new term is physicalism:
http://en.wikipedia.org/wiki/Physicalism

The difference had eluded me. Thank you.

I'll happily accept the replacement of 'materialism' with 'physicalism' throughout my last post, as it doesn't materially(!) alter my point.

 

[Goodison_Lad]

Then make the program very complicated, make its mood swing, give it a very good ability to analyze, learn, remember, seek patterns, make it fear some things, want some things, like some things, give it moral values, empathy, make it able to change its likings and wishes somewhat rationally to achieve a goal, somewhat randomly etc. Then you have a complicated program, making "decisions" where and how to go and what to do. Would that be called free will?

I'm sure that many people would indeed say that's all free will is - part of a supremely complex computer programme, with the ability to modify itself according to circumstances etc.

So this would be the sort of process that would be used to generate the illusory free will referred to: deterministic yet intricate enough to be not entirely 100% predictable. I think in its essential form it's part of the model of mind that the physicalists would propose.

Personally, I would not accept such a demonstration, no matter how sophisticated, to represent genuine free will.

 

[apeiron]

For all those arguing on the basis that they believe the brain to be a computer, time to learn some neuroscience...

http://faculty.washington.edu/chudler/bvc.html

 

[Credulous]

For all those arguing on the basis that they believe the brain to be a computer, time to learn some neuroscience...

http://faculty.washington.edu/chudler/bvc.html

No, I wouldn't say that the brain is a computer, at least in the way that we currently understand and build computers. The brain is structured in what has been called a neural network. But I think that how the brain computes is irrelevant to the fundamental question of free will, so long as we have agreed in the assumption that the brain is nothing more than a combination of matter and energy that can be completely described by the laws of physics. Some people may dispute this assumption, but that path opens up the question of how a physical process would be manipulated by something non-physical or outside it's chain of causation.

If we follow through with our assumption, let us go back to our electrical signal. Before the signal arrives, the brain is in a certain state. There is no way a neuron could be "aware" of the electrical signal's presence in the brain, other than the exact moment when the signal arrives. What is "making a choice" then? Is there any freedom in this system, or is a certain action inevitable? The neuron makes no choice, it either fires or doesn't fire based on how high the action potential is.

Because the results of the stimulus can be predetermined by looking at the physical state of the brain (neglecting quantum mechanics for the moment), I don't think that the choice was made at all. I think that choice is an illusion.

Still, many questions remain. What is consciousness? And now that I think about it, how does quantum randomness come into play in the brain, if at all?