What happened at 10am ET? 10-year Treasury yields spiked over 2 percent (an increase of 6 basis points) just as the written part of Ben Bernanke's testimony came out. The dollar rallied, commodities dropped. Stocks also moved down.

Ben Bernanke
CNBC.com

Traders immediately began searching for something in the testimony that was different than previous testimony, but you’d be hard pressed to find a notable shift in his tone.