The simple answer is that we no longer use the standard linear perceptrons that McCulloch and Pitts put forth in 1943. The limitations of perceptrons and their

The simple answer is that we no longer use the standard linear perceptrons that McCulloch and Pitts put forth in 1943. The limitations of perceptrons and their training algorithms are well-known and well-studied, and in the last 60 years we've come a long way. A book came out a little bit ago which covers basic neural networks, and culminates in showing a network that can estimate XOR [1]. I strongly recommend reading not only the chapter, but the whole book. [1] http://natureofcode.com/book/chapter-10-neural-networks/ http://natureofcode.com/book/chapter-10-neural-networks/