November 30, 2012

Waterloo researchers create world's largest functioning model of the brain

A team of researchers from the University of Waterloo has built the world's largest simulation


Spaun Anatomical architecture (credit: Chris Eliasmith et al./Science)



"This is the first model that begins to get at how our brains can perform a wide variety of tasks in a flexible manner—how the brain coordinates the flow of information between different areas to exhibit complex behaviour," said Professor Chris Eliasmith, Director of the Centre for Theoretical Neuroscience at Waterloo. He is Canada Research Chair in Theoretical Neuroscience, and professor in Waterloo's Department of Philosophy and Department of Systems Design Engineering.

Unlike other large brain models, Spaun can perform several tasks. Researchers can show patterns of digits and letters the model's eye, which it then processes, causing it to write its responses to any of eight tasks. And, just like the human brain, it can shift from task to task, recognizing an object one moment and memorizing a list of numbers the next. Because of its biological underpinnings, Spaun can also be used to understand how changes to the brain affect changes to behaviour.

"In related work, we have shown how the loss of neurons with aging leads to decreased performance on cognitive tests," said Eliasmith. "More generally, we can test our hypotheses about how the brain works, resulting in a better understanding of the effects of drugs or damage to the brain.”

In addition, the model provides new insights into the sorts of algorithms that might be useful for improving machine intelligence. For instance, it suggests new methods for controlling the flow of information through a large system attempting to solve challenging cognitive tasks.



Kurzweilai coverage

While the claim appears to be misleading, since IBM Research – Almaden actually recently simulated 530 billion neurons and 100 trillion synapses on a supercomputer, the Waterloo researchers explain that “although impressive scaling has been achieved, no previous large-scale spiking neuron models have demonstrated how such simulations connect to a variety of specific observable behaviors,” the researchers say in a Science paper.

Human-like multitasking

“The model can perform a wide variety of behaviorally relevant functions. We show results on eight different tasks that are performed by the same model, without modification.

“This is the first model that begins to get at how our brains can perform a wide variety of tasks in a flexible manner — how the brain coordinates the flow of information between different areas to exhibit complex behavior,” said Professor Chris Eliasmith, Director of the Center for Theoretical Neuroscience at Waterloo, Canada Research Chair in Theoretical Neuroscience, and professor in Waterloo’s Department of Philosophy and Department of Systems Design Engineering.

Unlike other large brain models, Spaun can perform several tasks. All inputs to the model are 28 by 28 images of handwritten or typed characters. All outputs are the movements of a physically modeled arm that has mass, length, inertia, etc.

Researchers can show patterns of digits and letters to the model’s eye, which it then processes, causing it to write its responses to any of eight tasks. And, just like the human brain, it can shift from task to task, recognizing an object one moment and memorizing a list of numbers the next. Because of its biological underpinnings, Spaun can also be used to understand how changes to the brain affect changes to behavior., the researchers suggest.

“Spaun provides a distinct opportunity to test learning algorithms in a challenging but biologically plausible setting,” say the researchers in Science. “More generally, Spaun provides an opportunity to test any neural theory that may be affected by being embedded in a complex, dynamical context, reminiscent of a real neural system.”

“In related work, we have shown how the loss of neurons with aging leads to decreased performance on cognitive tests,” said Eliasmith. “More generally, we can test our hypotheses about how the brain works, resulting in a better understanding of the effects of drugs or damage to the brain.”

In addition, the model provides new insights into the sorts of algorithms that might be useful for improving machine intelligence. For instance, it suggests new methods for controlling the flow of information through a large system attempting to solve challenging cognitive tasks.

Professor Eliasmith has written a book on the research: How To Build A Brain will be availabe this winter.

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