Dollar/yen falls as risk appetite wanes following Bernanke

* Fall in U.S. bond yields seen hurting greenback

* Euro/dollar stalls as Europe stress test results in focus

The dollar slid close to a seven-month low against the yen on Thursday after Federal Reserve chairman Ben Bernanke said the U.S. economic outlook was "unusually uncertain", sparking a sell-off in riskier assets. Read more