"Geoff Hinton knows how the brain works" https://www.youtube.com/watch?v=mlXzufEk-2E
IBM's Watson doesn't understand anything. It just measures statistical correlations between pairs of things. Same for Siri
IBM's chips are based on spiking neurons. These will let existing algorithms run extremely fast, and are very useful, but are not "how the brain works".
There are fundamental (large) gaps in our understanding of how we think. We don't really know how it works at all, despite the hype.