There was a very troubling 100 second interval at the end of Yellen's 50 minute, 5,000+ word speech in Amhert on Thursday, in which the 69-year old Yellen suddenly seemed unable to read the words on the page, was rereading the same phrase over and over, paused for long stretches at a time, and then had a violent reaction that forced her to end her speech prematurely. Watch it again below. But more disturbing was the Fed's reaction. As the WSJ reports, a Federal Reserve spokeswoman declined Friday to say if Chairwoman Janet Yellen resumed a normal work schedule or sought follow-up medical attention a day after she appeared ill near the end of a long speech in Amherst, Mass. Ms. Yellen returned to Washington on Friday.