One of the bigger challenges in designing a computer that works like a brain is that computers are not very bright. They can do math faster than humans, and they can run through thousands of data points in a fraction of a second. But ask a computer to read the bad handwriting on your prescription, or recognize an object based on seeing just a fraction of it, and it stumbles.
On top of that, the fastest and most sophisticated computers are power hogs. A typical human brain may not compute very fast, but it uses only about a watt or so of power. A late-model Cray supercomputer uses about 45,000 watts per cabinet; such computers can eaily consume megawatt levels of energy in some configurations.
Read More: http://news.discovery.com/tech/ibm-unveils-chips-based-on-brain-110823.html
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