Fruit Fly -- Arena (image) University of Washington Caption A fruit fly is tethered in a light-emitting diode, or LED, flight arena. The arena is one of the researchers' main tools for examining how a fruit fly responds to visual stimulus. Credit Floris van Breugel Usage Restrictions News use only. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.