title: Testing a multidimensional nonveridical aircraft collision avoidance system.
abstract: OBJECTIVE
  This study explores operators' ability to use a multidimensional, nonveridical control display.
  
  
  BACKGROUND
  Veridical displays represent realistic scenes. State space displays represent nonveridical n-dimensional information based on informative coordinate axes plus variable features such as color and shading. Empirical investigation of state space displays is relatively new to human factors research.
  
  
  METHODS
  Twelve licensed general aviation pilots flew flight scenarios, trying to deviate as little as possible from a preassigned course while still maintaining standard en route separation from traffic. Flight performance using only a veridical cockpit display of traffic information (CDTI) was compared with performance using the CDTI augmented by a 4-D nonveridical state space collision avoidance system (CDTI+4CAS).
  
  
  RESULTS
  Using moderate traffic density and complex traffic geometry, the CDTI+4CAS condition showed performance superiority over the baseline CDTI-only condition for five of five dependent measures of maneuver efficiency, four of four measures of maneuver safety, and six of nine measures of user workload.
  
  
  CONCLUSIONS
  Results suggest that nonveridical information display may enhance operator performance on a control task involving simultaneous processing of multidimensional information.
  
  
  CONCLUSIONS
  Nonveridical information displays have potential application wherever human control of multidimensional processes is involved.
authors.affiliation: Maneuver Space Technologies, Pocasset, OK 73079, USA. wknecht@maneuverspacetechnologies.org
authors.forename: William R
authors.initials: WR
authors.lastname: Knecht