Prior research indicates that during roll maneuvers in visual meteorological conditions (VMC) pilots exhibit the opto-kinetic cervical reflex (OKCR), an instinctive postural response that humans use to maintain awareness of their spatial orientation. This simulator study was conducted to see if a moving-horizon attitude indicator (AI), electronic attitude indicator (EAI), or Synthetic Vision System (SVS) would elicit the OKCR. The current research found evidence of the OKCR in pilots who viewed both an SVS display and an EAI. Pilots viewing a standard moving-horizon AI produced very little OKCR response.
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