What a maze-solving oil drop tells us of intelligence
By Colin Barras | NewScientist.com
Dyed pink and doped with acid, the small, inanimate drop of oil is deposited at the entrance to the maze - and immediately sets off towards the exit. A few minutes later, it emerges at the other end.
No one would equate this apparently astonishing problem-solving with intelligence. But new theories on human intelligence and the brain suggest the simple molecular processes governing the oil droplet's apparently smart behaviour may be fundamentally similar to those that govern how we act.
A decade ago Toshiyuki Nakagaki, now at Hokkaido University in Sapporo, Japan, reported that the slime mould Physarum polycephalum could negotiate a maze to reach food at the exit. Boldly, his team wrote in Nature: "this implies that cellular materials can show a primitive intelligence".
Now Bartosz Grzybowski, a chemist at Northwestern University in Evanston, Illinois, has shown that a simple oil droplet floating on top of an aqueous solution can also navigate a complex maze - in this case to reach an acid-soaked lump of gel at the exit.
The droplet moves because the gel sets up a pH gradient within the maze. The acid changes the surface tension of the oil droplet, but because of the pH gradient, it affects opposite sides of the droplet unequally. The surface tension is different at the slightly more acidic "front" of the droplet than at the back. This difference is what is ultimately responsible for moving the droplet towards the maze's exit.
Obstacle course. On the left, a droplet moves toward the dashed box along the shortest path. On the right, the droplet goes astray at two locations but corrects its trajectory and ultimately finds the shortest path. CREDIT: ISTVAN LAGZI, BARTOSZ GRZYBOWSKI, ET AL., JACS
Nakagaki is unwilling to extend the notion of intelligence to the oil droplet. "It is nonsense for me to consider intelligence in non-living systems," he says. But Andy Clark, a philosopher at the University of Edinburgh, UK, suggests that this does not do Grzybowski's set-up justice. Much of biology boils down to chemistry, Clark points out. "The mere fact that it's just physical stuff doing what it does can't be a strike against the droplets," he says. "Whatever intelligence is, it can't be intelligent all the way down. It's just dumb stuff at the bottom."
So why does the dumb droplet appear to be moving in an intelligent way? The answer is all around us, says Clark. The aqueous environment surrounding the droplet is structured to such a high degree by the pH gradient that it makes the dumb droplet appear smart. "It's a neat demonstration of just how much problem-solving punch you can get from a minimal internal structure in a nicely enabling environment."
Humans rely on the same trick, says Clark. It forms the basis of the extended mind theory, which Clark and David Chalmers, now at the Australian National University in Canberra, proposed in the late 1990s. They say the division between mind and environment is less rigid than previously thought; the mind uses information within the environment as an extension of itself.
While a person can learn a route through a maze and then negotiate the maze by memory, a person would appear equally smart to an outsider if they simply followed signposts in the maze to reach the exit. "A smart person, like the droplets, is often smart due to canny combinations of internal and external structure," says Clark.
It's a powerful idea that is filtering into theories about artificial intelligence. Rolf Pfeifer at the University of Zurich in Switzerland is exploring how to "outsource" some of the cognitive load of artificially intelligent systems. He points out evidence that the way our knees absorb the energy of a jump is controlled by the material properties of the leg itself: the reactions happen too quickly to be controlled by the brain or even a reflex. Through careful choice of materials, Pfeifer is now applying that idea in his robot creations by designing body parts that are capable, to some degree, of autonomously reacting to their environment.
Karl Friston, a neuroscientist at University College London, goes further. He says the human brain and the oil droplet do share some fundamental attributes, in particular in the way they both respond to their environment.
This ties in with Bayesian brain theory, which pictures our brains as attempting to understand the world by observing the environment and making, then improving, predictions about what will happen next. Friston is working on a unified theory of the brain (New Scientist, 31 May 2008, p 30) that mathematically describes how the brain continually improves its predictions by observing its environment and minimising errors.
He sees "deep similarities" between his theory and the droplet's movement. As the droplet moves towards the exit it is moving towards a state of chemical equilibrium, where it has minimised its free energy.
Work on artificial neural networks has shown that the same principles apply to these networks: by minimising the difference between the predictions a network makes and what it actually senses happening, the network is also driven towards equilibrium. Friston is now showing how the equations that govern neural networks and thermodynamic systems apply to real brains.
The bottom line is that the "dumb" droplet is simply obeying fundamental principles. But because it is using exceptionally ordered information in the environment along the way, it moves "in an apparently purposeful way", Friston says.
None of this, of course, justifies calling Grzybowski's oil droplet "intelligent". But it does suggest that by highlighting the importance of the environment, his maze experiment may have hit on a fundamental connection between apparently intelligent behaviour at all levels: the ability to read and respond to environmental cues.
Article from: NewScientist.com
Kevin Warwick - Artificial Intelligence & The Rise of the Machines in 2020
Aaron Franz - The Age of Transitions
aron Franz - The Age of Transitions Continued (Subscription)
John Lash - Artificial Technomania of the Archons (Subscription)
Jim Elvidge - Are we Living in a Simulation, a Programmed Reality?
Lynne McTaggart - The Intention Experiment
Blob intelligence is not unlike our own
'Intelligent' oil droplet navigates chemical maze (Video)
The Creation of Smarter Than Human Intelligence
Artificial brain '10 years away'
Artificial intelligence: The robots are coming but are we ready for them?
Artificial Intelligence Cracks 4,000-Year-Old Mystery
The effect of belief on intelligence
Psychology of Intelligence Analysis
Aubrey de Grey, Artificial Intelligence, Singularity, Longevity and the Holy Grail
Plants Recognize Their Siblings, Biologists Discover
Plants and Animals: Long-Lost Relatives?
Insects Use Plants Like A Telephone
Scientists "listen" to plants to find water pollution
Plant communication: Sagebrush engage in self-recognition and warn of danger
Latest News from our Front Page
Professor: Reason Itself Is A White Male Construct
A philosophy and religion professor at Syracuse University gave an interview to The New York Times Thursday in which he critiqued the notion of pure reason as simply being a “white male Euro-Christian construction.”
Prof. John Caputo was being interviewed by fellow philosophy professor George Yancy for the 13th installment of an interview series Yancy conducts with philosophers regarding racial topics.
Given its emphasis on first principles ...
The Broken Window Fallacy
Youtube description: This short video explains one of the most persistent economic fallacies of our day.
Jenji Kohan and the Jewish Hyper-Sexualization of Western Culture
As detailed in The Culture of Critique, Freud and his followers regarded anti-Semitism was a universal pathology which had its roots in sexual repression. The theoretical basis for this can be found in Freud’s Three Essays on the Theory of Sexuality where he linked aggression to the frustration of human drives — especially the sex drive. Kevin MacDonald notes that: ...
Confederate History - Dispelling the Myths
History books, the media, the school systems, etc abound in falsehoods and inaccuracies of Confederate and Southern history. This fact sheet will help to clarify and dispell some of these rampant inaccuracies.
MYTH - The War of 1861 - 1865 was fought over slavery.
FACT - Terribly untrue. The North fought the war over money. Plain ...
Gays Rights May Open Door for Pedophile Rights
Democrats have attempted to normalize pedophilia as a sexual orientation.
A recent Supreme Court ruling on same-sex marriage may soon allow pedophiles to argue they are suffering discrimination.
“Using the same tactics used by ‘gay’ rights activists, pedophiles have begun to seek similar status arguing their desire for children is a sexual orientation no different than heterosexual or homosexuals,” writes Jack Minor ...
|More News » |