IEEE Spectrum has published an interesting article titled "IBM Unveils a New Brain Simulator: A big step forward in a project that aims for thinking chips". The post describes IBM’s Almaden Research Center latest simulation effort announced at the Supercomputing Conference (SC09), where they unveiled that "that they have created the largest brain simulation to date on a supercomputer. The number of neurons and synapses in the simulation exceed those in a cat’s brain; previous simulations have reached only the level of mouse and rat brains." There is a subtle, but important, difference between simulating the "number of neurons and synapses of a cat’s brain", and "simulating the cat's brain". To put it simply, it's like "simulating a car" by putting together the same number of screws, pieces of metal, plastic, rubber, etc that a car has. There is no guarantee, actually there is strong argument to the contrary, that all those pieces will work as a car. Another approach, as Modha himself notices, is to ”to demonstrate brainlike visual perception, decision [making], planning, and navigation in virtual environments”. In order to achieve these tasks, you do not need a whole brain (and the nuclear power plant that goes with the simulator). This is fortunate, and very detailed models of brain areas that ACTUALLY DO SOMETHING exist, and continue to be produced, at a very high rate. Bottom line: I would love to see an article that talks about the "next step", namely having the simulated brain actually do something, rather than simulating an even larger, and more expensive, bag of neurons whose "intelligence", or ability to do anything adaptive, is inferior to the brain of an insect.
The subtle difference between simulating brains and number of cells
November 19, 2009|