WASHINGTON (AP) - Chairman Ben Bernanke says the U.S. economy still needs help from the Federal Reserves' low interest rate policies.

Bernanke is telling the National Bureau of Economic Research that because unemployment remains high and inflation is below the Fed's target, the policies are still necessary. He also said the economy is also being held back by higher taxes and federal spending cuts.

Bernanke is answering questions after a speech in Cambridge, Mass. that focused on the Fed's successes and failures in managing the economy over the past 100 years. Bernanke didn't signal any changes in the Fed's bond-buying program during his remarks.