ABSTRACT
Typical tasks undertaken by the vehicle crew require periods of between 1 and 4 hours of sustained vigilance and may include observing large areas of ground through which a few enemy vehicles may pass or listening for occasional radio messages which are sent to that vehicle which occur at infrequent intervals and without warning. The aim of this project was to investigate whether or not human performance of a vigilance task is affected by operating in a reclined sitting posture.
