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Artificial Intelligence Helps Reveal How People Process Abstract Thought

By University of Houston | October 11, 2018

As artificial intelligence becomes more sophisticated, much of the public attention has focused on how successfully these technologies can compete against humans at chess and other strategy games. A philosopher from the University of Houston has taken a different approach, deconstructing the complex neural networks used in machine learning to shed light on how humans process abstract learning.

“As we rely more and more on these systems, it is important to know how they work and why,” said Cameron Buckner, assistant professor of philosophy and author of a paper exploring the topic published in the journal Synthese. Better understanding how the systems work, in turn, led him to insights into the nature of human learning.

Philosophers have debated the origins of human knowledge since the days of Plato – is it innate, based on logic, or does knowledge come from sensory experience in the world?

Deep Convolutional Neural Networks, or DCNNs, suggest human knowledge stems from experience, a school of thought known as empiricism, Buckner concluded. These neural networks – multi-layered artificial neural networks, with nodes replicating how neurons process and pass along information in the brain – demonstrate how abstract knowledge is acquired, he said, making the networks a useful tool for fields including neuroscience and psychology.

In the paper, Buckner notes that the success of these networks at complex tasks involving perception and discrimination has at times outpaced the ability of scientists to understand how they work.

While some scientists who build neural network systems have referenced the thinking of British philosopher John Locke and other influential theorists, their focus has been on results rather than understanding how the networks intersect with traditional philosophical accounts of human cognition. Buckner set out to fill that void, considering the use of AI for abstract reasoning, ranging from strategy games to visual recognition of chairs, artwork and animals, tasks that are surprisingly complex considering the many potential variations in vantage point, color, style and other detail.

“Computer vision and machine learning researchers have recently noted that triangle, chair, cat, and other everyday categories are so dif?cult to recognize because they can be encountered in a variety of different poses or orientations that are not mutually similar in terms of their low-level perceptual properties,” Buckner wrote. “… a chair seen from the front does not look much like the same chair seen from behind or above; we must somehow unify all these diverse perspectives to build a reliable chair-detector.”

To overcome the challenges, the systems have to control for so-called nuisance variation, or the range of differences that commonly affect a system’s ability to identify objects, sounds and other tasks – size and position, for example, or pitch and tone. The ability to account for and digest that diversity of possibilities is a hallmark of abstract reasoning.

The DCNNs have also answered another lingering question about abstract reasoning, Buckner said. Empiricists from Aristotle to Locke have appealed to a faculty of abstraction to complete their explanations of how the mind works, but until now, there hasn’t been a good explanation for how that works. “For the first time, DCNNs help us to understand how this faculty actually works,” Buckner said.

He began his academic career in computer science, studying logic-based approaches to artificial intelligence. The stark differences between early AI and the ways in which animals and humans actually solve problems prompted his shift to philosophy.

Less than a decade ago, he said, scientists believed advances in machine learning would stop short of the ability to produce abstract knowledge. Now that machines are beating humans at strategic games, driverless cars are being tested around the world and facial recognition systems are deployed everywhere from cell phones to airports, finding answers has become more urgent.

“These systems succeed where others failed,” he said, “because they can acquire the kind of subtle, abstract, intuitive knowledge of the world that comes automatically to humans but has until now proven impossible to program into computers.”

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