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Coming To Grips With Free Will

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Index to posts in this series

Agency

Michael Tomasello didn’t write about the evolution of free will. His book is called The Evolution Of Agency. Even so, I think we should understand Tomasello’s model as a partial defense of free will.

The idea behind the book is that the psychological processes that characterize our species are the result of evolution and evolutionary pressures. That includes agency. Recall from this post that Tomasello gives this description of agency:

…[I]n the current case, we may say that agentive beings are distinguished from non-agentive beings … by a special type of behavioral organization. That behavioral organization is feedback control organization in which the individual directs its behavior toward goals—many or most of which are biologically evolved—controlling or even self-regulating the process through informed decision-making and behavioral self-monitoring. Species biology is supplemented by individual psychology. P. 2,

This description of what we mean by agency doesn’t explain how we set goals. But I think as a first approximation that we set goals “through informed decision-making and behavioral self-monitoring”, heavily influenced by our families and communities through what Tomasello calls socially normative agency. We examine as many aspects of our situation as we can think of and handle, we apply our decision-making tools, we decide. Among the constraints for decision-making we consider the incentives and constraints of our society.

Once our goals are set, we consider the ways we might reach them, and choose the one that seems most likely to enable us to reach the goal. We monitor our results, and make adjustment as we go along, including changing the method of reaching the goal, or the goal itself, if that seems better to us.

Determinists

Some scientists deny the existence of free will, including  Robert Sapolsky, a Stanford neurobiologist.  He explains why he thinks we have no free will in this LA Times interview about his recent book Determined.

Here’s an essay in The New Yorker by Nikhil Krishnan, a philosopher at Cambridge, discussing the book in the context of philosophy.  This article says that Sapolsky doesn’t define the term free will, but offers

a challenge. A man, Sapolsky invites us to imagine, “pulls the trigger of a gun.” That’s one description. Another is that “the muscles in his index finger contracted.” Why? “Because they were stimulated by a neuron,” which was in turn “stimulated by the neuron just upstream. . . . And so on.” Then he throws down the gauntlet: “Show me a neuron (or brain) whose generation of a behavior is independent of the sum of its biological past, and for the purposes of this book, you’ve demonstrated free will.”

First, how exactly would that kind of free will have evolved?

Second, that’s not how people think of free will. In normal usage free will is about the ability of the individual to make choices among alternatives, a view central to Tomasello’s model. I could shoot my gun, or I could not shoot my gun. Both are within the range of possible actions, and I can choose between them. Sapolsky thinks the fact that I don’t shoot is the result of every bit of experience in my past, and that I had no real choice. Someone else with a different past might not have any choice but to shoot. Tomasello, I think, would say that I can think rationally about whether or not to shoot the gun, examine the possible consequences, determine which action accomplishes my goals, and act on that reasoning

Examples

1. If someone had asked me 30 years ago what my favorite color is, I would not have had much of an answer. I might have said I don’t have one, or I might have said British Racing Green; or maybe blue, which is close to a non-answer. Today I would say jewel tones: ruby red, dark blue sapphire, intense emerald green. I can point to several reasons for this change. One is seeing the lapis lazuli blues of early Renaissance Sienese paintings of the Virgin Mary, and a ring we bought, gold with tiny sapphires.

2. Lake, a deeply conservative Trumpish Republican, attends a work-related dinner with their partner. Lake doesn’t know anything about the people at the table. The conversation turns to politics. Lake doesn’t want to impede their partner’s career, and keeps quiet.

3. Albert Einstein at the age of 16 imagines what he would see if he were riding side by side with a beam of light. A few years later he suddenly realizes the implications of the answer.

Analysis of examples

1. Favorite color doesn’t implicate goals. It seems to be about recognizing a thing that gives us pleasant feelings. The example asks if we can know whether a thing gives us pleasure, not whether we can choose what gives us pleasure.

It seems likely that we can train ourselves to take pleasure in things. I like opera, but that wasn’t always so. I learned to like opera by attending operas, listening to opera singers, and eventually singing opera chorus. How exactly does that relate to free will? Would Sapolsky say I had no choice in the matter?

2. This example seems fairly close to the foraging examples used by Tomasello, including the ones about our early modern human ancestors. Each person in the group has to play a role. Lake’s role is not to irritate the other people at the table and hurt Lake’s partner’s ability to bring home the bacon. Was that an exercise of free will by Lake?

3. I chose the Einstein example because I’ve always thought it was a singular insight into an otherwise intractable problem. The greatest works of art, music, literature and inquiry also show us a singular insight into our world, other people, and ourselves.

This example seems to combine elements of the first two. Why was Einstein thinking about this bizarre hypothetical at age 16? How much of the solution he eventually reached depended on the fact that other people were thinking about and working on that problem? Would Sapolsky agree that this is so far outside normal human behavior that it qualifies as free will? Is the concept of free will relevant to this example?

Conclusion

Of course, there isn’t an answer to this disagreement, so here’s what I think. Our bodies, including our cognitive processes and our psychological processes, co-evolved in a way that encouraged collaboration as a survival tactic. We learned to cooperate in gathering food, making simple tools and clothing, and protecting the group. It turns out that the cognitive and psychological processes we evolved are useful for other things, like making music, decorating plates and bowls, and inventing airplanes. They can be used for darker purposes. They can be used for highly abstract purposes, like set theory and surreal poetry.

We can also act rationally, just like Einstein thinking about the nature of light. We can force ourselves to examine as best we can the likely outcomes of our actions. We can use that skill to decide what we want and how best to get it. We can choose to act on the results of that rational thought or not. That’s enough free will for me.

creative commons

Free Will, Agency, And Evolution

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Most of us think we have free will, and we certainly act as if we do. We expect ourselves to do certain things and not do other things, and we feel responsible for those choices. We have the feeling, the sense, that we control those behaviors, or at least that we have the ability to control decisions about which things we do and which we don’t. We attribute to other people their own agency, which we take to be just like ours, even if they may have different ideas about proper behavior.

There’s a school of thought that says we don’t control those things. Here’s a recent article about Robert Sapolsky, a Stanford University neurobiologist, who doesn’t agree. He’s not the only one. Perhaps recognizing that this is an intractable problem, many scientists use the term agency instead of free will.

One is Michael Tomasello, whose book, The Evolution of Agency, I’ll be examining in the next few posts. Agency carries less moral baggage, and it’s something that can be described and studied neutrally; at least more neutrally. Tomasello doesn’t give a precise definition of agency. This is from the introduction:

…[I]n the current case, we may say that agentive beings are distinguished from non-agentive beings … by a special type of behavioral organization. That behavioral organization is feedback control organization in which the individual directs its behavior toward goals—many or most of which are biologically evolved—controlling or even self-regulating the process through informed decision-making and behavioral self-monitoring. Species biology is supplemented by individual psychology. P. 2.

The book rests on two assumptions. The first is that the basis of agency is a feedback control activity, a psychological mechanism, seated in the brain. The second is that agency is an outcome of evolution.

Feedback control organization

Tomasello’s feedback control organization works like a thermostat. The idea is that a goal is set for the thermostat: keeping the temperature at a certain level. It has a sensor that measures the ambient temperature and compares it to the goal. It then turns on another device that brings the temperature closer to the goal. It continues to test the ambient temperature and when it reaches the goal, it turns off the device.

Tomasello claims that this is the only model that can work to enable things to control themselves. He points out that all efforts to get machines to operate autonomously work in accordance with this model.

Evolution and agency

Tomasello doesn’t think there’s a goal for evolution. He thinks that as brains become more complex, the feedback control activity takes on a different shape, a shape that takes advantage of the bigger brain. I’ll just toss in the observation that mutations happen all the time, and some become established in subpopulations whether or not they have any survival value. That might include hair color or a larger brain. If circumstances change, the mutation may suddenly have survival value, and the subpopulation thrives while the rest of the population suffers.

Studying psychological processes

Tomasello says agency is a psychological process, one that occurs in the brain of an individual creature. It cannot be studied directly. Instead scientists infer the existence of psychological processes from the overt behavior of subjects.

Scientists infer psychological agency when the organism acts flexibly toward its goal even in novel contexts. To behave in this flexible manner, the individual must go beyond a stimulus-driven, one-to-one mapping between perception and action. The individual must be capable of choosing to act or not to act, or among multiple possible actions, according to its continuous perceptual assessment of the situation as it unfolds over time (sometimes employing executive processes such as inhibition, as a further control process, during action execution). P. 27.

The layout of the book

Evolution has been at work on this planet for hundreds of millions of years. We say that different species split off from lines of evolution, as humans split off from the great apes; and as homo sapiens eventually split off from the first hominids, and then evolved into modern humans. The lines go back to the beginnings of life on the planet, to the earliest living creatures.

Tomasello thinks certain existing species have no agency, and the rest fall into four categories. He selects five of them to represent his five categories of agency.

1. No agency: C. elegans, a tiny worm-like creature (the image on the home page is a bunch of these creatures)
2. Goal-directed agency: lizards as representative of reptiles
3. Intentional agency: squirrels as representative of small mammals
4. Rational agency: great apes as representative of great apes
5. Socially normative agency, which has two subcategories
a) young human children as representative of hominids with a simple form of socially normative agency
B) adults humans who exhibit a more comprehensive socially normative agency

Tomasello treats each category of agency in its own chapter. The last chapter is mostly for his fellow scientists, discussing gaps in the research and proposals for future work on this model. In each chapter Tomasello explains how the agency works, the evolutionary pressures that might have led to it, and the nature of the world as perceived by the example creatures. These issues are supported by a empirical evidence from academic and field studies.

I’ll take a quick look at the first three levels of agency, and discuss socially normative agency in more detail.

Creatures without agency

Let’s start with C. elegans. This is a worm-like creature about 1 mm in length. We know a great deal about it: we have sequenced its genome; and identified its 302 neurons, their connections, and the role each plays. It has no sensory apparatus beyond the ability to sense nutritious and certain noxious substances. It lives in organic material, where it eats bacteria. It has rudimentary powers of movement. They are mostly hermaphrodites. For more, see this dense Wikipedia entry.

Basically it moves around in organic muck eating bacteria. If it isn’t finding any, it moves. If it detects a noxious substance it moves. That’s about it. Tomasello says that with the tiny number of neurons, it’s hard to imagine the creature could have a goal, let alone behave flexibly to achieve it. It is purely stimulus driven. It’s sensory apparatus is very simple, so it only recognizes a few stimuli, and it responds to them mechanically.

In Tomasello’s terms, this creature is non-agentive. He calls it an animate actor. There’s not much else to say about it.

Discussion

I’m not fond of the word “agentive”, which strikes me as an ugly neologism, but it points to somehting about human behavior. Not all of our behavior is agentive. Take breathing. We can control it, but mostly we don’t. It’s an interesting exercise to think about what parts of our actions are agentive.

Another way to put that is to ask how much we resemble C. elegans.