The sluggishness in the credit markets that triggered much of the heavy selling in markets around the world since mid-September appeared little changed Thursday following days of efforts by the Federal Reserve and other central banks to resuscitate lending.

Libor, the bank lending benchmark, for three-month dollar loans rose to 4.75 percent from 4.52 percent on Wednesday. That signals that banks remain hesitant to make loans for fear they won’t be paid back.

The Fed and other leading central banks this week lowered key interest rates to help unclog the credit markets and promote lending to help the global economy. While a rate cut can take up to a year to work its way through the economy, the move was aimed as a boost to investor sentiment.

“We’re stuck in a morass and I think it’s going to take quite some time to come out of it,” said Stephen Carl, principal and head of equity trading at The Williams Capital Group.

Demand remained high for short-term Treasurys, a refuge for investors willing to trade modest returns to protect their money. The yield on the three-month Treasury bill, which moves opposite its price, fell to 0.51 percent from 0.63 percent late Wednesday. Longer-term debt prices fell, with the yield on the 10-year note rising to 3.79 percent from 3.65 percent late Wednesday.

Investors across markets were mulling a plan being considered by the Bush administration to invest in hobbled U.S. banks as a way to stabilize the financial sector. The $700 billion rescue package signed into law last week allows the Treasury Department to inject fresh capital into financial institutions and obtain ownership shares in return.

Britain rolled out a similar plan, though no U.K. bank has received any investments. In Iceland, the government now has control of the country’s three major banks as it struggles to contain the troubles there.

Wall Street is also looking for any effects of short selling now that a three-week ban imposed by regulators has expired. Short selling is a technique in which investors borrow shares in a company from a broker and sell them, hoping to buy them back later at a lower price. Essentially, it’s a bet that a stock’s price will fall. Short sellers can lose money if they have to repurchase the stock after it has risen.

Some analysts believe the unprecedented ban on short selling — an effort to bolster investor confidence — did more harm than good at a time of historic market volatility. They contend that short sellers help the market rally by covering their bets and creating demand for stocks.

“I think the market’s way oversold. But I can’t stand in the way of this falling knife — I’d get sliced open,” said Phil Orlando, chief equity market strategist at Federated Investors. “Investors are just saying, get me out at any price.”

He also said that with the short-selling rule back in play, hedge funds might be shorting again to make up for their forced liquidations.

The tech sector saw less selling than other parts of the market after IBM Corp. affirmed its forecast.

IBM fell $1.55, or 1.7 percent, to $89. Meanwhile, Intel fell 65 cents, or 4 percent, to $15.60. Microsoft fell 71 cents, or 3.1 percent, to $22.30.

Energy names were among the biggest decliners as the price of oil fell. Exxon Mobil Corp. fell $9, or 12 percent, to $68, while Chevron Corp. fell $9.10, or 12 percent, to $64.

Light, sweet crude fell $1.81 to settle at $86.62 a barrel on the New York Mercantile Exchange, the lowest closing price since October last year.