Tokyo stocks fell Wednesday morning as declines in Wall Street indexes overnight dampened sentiment, while a stronger yen spurred selling of some exporters. The 225-issue Nikkei Stock Average fell 257.57 points, or 0.68 percent, from Tuesday to 37,805.35. The broader Topix index was down 15.25 points, or 0.57 percent, at 2,655.29. The U.S. dollar briefly weakened to the upper 144 yen zone before largely trading in the mid-145 yen range, amid increasing confidence the Federal Reserve will cut interest rates at its September meeting. At noon, the dollar fetched 145.39-40 yen compared with 145.19…