The Magnificent Multi-Agent Mind of Marvin Minsky

May 9, 2023 — If you want to understand the mind, start with Marvin Minsky. There are many people that claim to be experts on the brain, but I've found nearly all of them are unfamiliar with Minsky and his work. This would be like a biologist being unfamiliar with Charles Darwin.

To be fair, there is a big difference between a biologist unaware of Darwin today versus back in the 1800's. It is a lot more forgivable to be unaware of Minsky today than it will be in fifty years. It takes time for the most enduring signals to stand out.

The Only Way to Understand the Mind is to Build One

Minsky had an extremely skeptical view of the fields of psychology and psychiatry. His approach to understand the mind was through attempting to build one. He conducted countless experiments to figure out the details, using crayfish claws, building the very first robots, and pioneering the field of software AI. The theories he developed from his play-like, bottom up, experimental approach I would personally bet will prove far more accurate and useful than all the theories from 20th century psychology and psychiatry combined.

A well known Richard Feynman quote is "What I cannot create I do not understand." I wonder if Feynman's friend Minsky inspired this quote.

Minsky mocked psychiatrists and the pharmaceutical industry with their chemical view of the brain. Imagine thinking you could fix a computer if you just adjusted the ratio of Copper-63 vs Copper-65 in the CPU. These people have no idea what they are doing or talking about, and Minsky called them on it. The thinking processes matter most, not the materials.

The Basic Idea

Minsky's view of the mind is one composed of a "society of tiny components that are themselves mindless". A person is a collection of agents, which are like programs and processes. Outputs from some agents may be inputs for others. Mathematically it could be modeled very roughly like this:

Mind = P_{A_1} \circ P_{A_2} \circ \ldots \circ P_{A_N}

Where P represents a running process of an agent and N is the number of agents that constitute a mind/person.

N might be very large. Minsky says hundreds in his talks, which might actually be a lower bound. If someone formed a new agent everyday, on average, it could be over ten thousand by the age of 30. If it took 1 million neurons to form one "agent" we could have 100,000 agents—the range of possibilities is large. Minsky's ideas are a conceptual framework, and it's up to science to figure out whether the agents model is correct and how many there might be1.

But I don't want to use too much of your time to give you a second hand regurgitation of his ideas.

Suggested Reading (and watching)

My goal with this post is to beg you, if you want to understand the mind, to start with Minsky. Pickup his book Society of Mind. I believe Society of Mind is the Origin of Species of our times. You cannot understand biology without modeling its evolutionary processes and you cannot understand the mind without modeling its multi-agent processes.

Also get The Emotion Machine. There is a lot of overlap, but these are important enough ideas that it's good to see them from slightly different perspectives.

Alongside his books watch videos of him to get a fuller perspective on his ideas and life. There is an MIT course on OpenCourseWare. There's a great 1990 interview. And this 151 episode long playlist will not only enlighten you about his ideas but entertain you with stories of Einstein, Shannon, Oppenheimer, McCarthy, Feynman and so many of the other great 20th century pioneers who were his contemporaries and colleagues.

Why are so many hogwash theories of the brain still dominant?

In college I took some courses on the brain. This was in the 2000's at a "top" school. We covered the DSM but not Minsky. How could we not have covered Minsky? How could we have not talked about multi-agent systems? These are far better ideas.

My guess is financial pressures. As Sinclair wrote: "It is difficult to get a man to understand something, when his salary depends on his not understanding it." A lot of salaries depend not on having a better understanding of the brain, but on continuing business models based on flawed theories. I came across a great term the other day: the Mental Health Industrial Complex. Though the theories these people have about the mind are not real, the money they earn from pills and "services" is very real-in the tens of billions a year. You might think that because these people have "licenses" their skills are not fraudulent. I'll point out that in Cambridge, MA, licenses are also given to Fortune Tellers.

A Solid Foundation

Minsky certainly didn't figure it all out. You'll see in his interviews he is very clear about how much we don't understand and he talks about the future and what devices we need to figure out more of the puzzle. Researchers at places like Numenta and Neuralink continue down the path that Minsky started.

He didn't figure it all out but he certainly found a solid foundation. The people in computer science who took his ideas seriously are now building AIs that are indistinguishable from magic. Whereas the people in the mental health fields who have ignored his ideas in favor of the DSM continue to make things worse.

1 A Thousand Brains by Jeff Hawkins is a recent interesting effort in this direction.

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