Prometheus wrote:
http://www.topendsports.com/testing/reactionquiz.shtml
On this one my most frequent results were 0.37 when using the mouse and 0.26 when using the keyboard (the latter is similar to my previous result). This test has a flaw in that the background often changes too fast, before one has a chance to move the mouse or bring keyboard focus to the "Stop" button. Such results should be discarded.