Faster than a flash: The fastest visual startle reflex response is found in a long-legged fly, Condylostylus sp. (Dolichopodidae)

Abstract

An extremely fast escape response time of less than 5 milliseconds was found in a long-legged fly of the genus Condylostylus (Dolichopodidae). This response to a visual startle reflex caused by a photographic flash was recorded repeatedly on camera and the synchronized shutter speed made it possible to measure the reflex time. Habituation was also observed in these trials. This newly recorded reflex is 3 times faster than any other previously reported. On 30 March 2011, an opportunity arose to measure the speed of reaction of another Condylostylus sp. in the same location using the same technique and equipment, and the results were very similar to those reported here.