The Nikkei stock index briefly rose over 3 percent Wednesday morning after erasing earlier losses in volatile trading, as the yen slid after a Bank of Japan deputy chief indicated a cautious stance over raising interest rates. The dollar briefly rose over 2 yen to the lower 147 yen range after BOJ Deputy Governor Shinichi Uchida said that the central bank will keep its policy rate at the current level to maintain monetary easing and will not raise it further when financial markets are unstable. The 225-issue Nikkei Stock Average rose 789.15 points, or 2.28 percent, from Tuesday to 35,464.61. T…