This paper describes an experiment in which an attempt was made to assess the value of two types of response, control activity and physiological activity, as indications of the effect on simulator fidelity of adding pitch motion cues. The investigation used a general-purpose research simulator and a two-seater Hunter T7 aircraft. The responses of nine experienced pilots were compared when, flying on instruments, they undertook the same flight plan under three different conditions. Namely: flight in he Hunter T7 aircraft: simulated flight in the simulator with pitch motion present;. simulated flight in the same simulator without motion.