document: Measuring keyboard response delays by comparing keyboard and joystick inputs The response characteristics of PC keyboards have to be identified when they are used as response devices in psychological experiments . In the past , the proposed method has been to check the characteristics independently by means of external measurement equipment . However , with the availability of different PC models and the rapid pace of model change , there is an urgent need for the development of convenient and accurate methods of checking . The method proposed consists of raising the precision of the PC 's clock to the microsecond level and using a joystick connected to the MIDI terminal of a sound board to give the PC an independent timing function . Statistical processing of the data provided by this method makes it possible to estimate accurately the keyboard scanning interval time and the average keyboard delay time . The results showed that measured keyboard delay times varied from 11 to 73 msec , depending on the keyboard model , with most values being less than 30 msec
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