Repeated loud warnings by financial advisers fail to reverse the human tendency to panic when the market plunges and to rush in after it’s gone up. Withdrawals from 401(k)s and IRAs surged between 2001 and 2003 after high-tech stocks declined, but the money went back in in 2005 through 2007 after the S&P500 index had soared nearly 27 percent in 2003 and 9 percent in 2004, according to new research by Thomas Bridges, a graduate student in economics, and Professor Frank Stafford, for the University of Michigan Retirement Research Center. “They think I have $500,000, and if I don’t take it out now it’s going to be $50,000. It’s a panic mentality,” said Stafford, who was surprised by what they found. Withdrawals increased…