Motion Inference During +Gz Acceleration
Interim rept., May 2004-Oct 2005
AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH HUMAN EFFECTIVENESS DIRECTORATE
Pagination or Media Count:
In the combat setting there are times when the pilots attention is drawn away from the target momentarily and then redirected back to the target. In this scenario the pilot must infer the targets new position based on information about its previous position. This study measured the effect of Gz on the pilots ability to make inferences about aircraft position. Methods Seven subjects 5 male 2 female participated. Ages ranged from 24 to 35 years. Acceleration profiles included 3, 5, and 7 Gz, for 15 sec and a 7 G simulated aerial combat maneuver. The psychomotor task involved a target light that traversed the curved path from left to right at a constant velocity and then disappeared. The observer stopped the target by estimating when the target would intersect a fixed point. A secondary task consisted of four letters inside a box subjects responded to sets containing a vowel. Results A repeated measures ANOVA was performed for the mean angle error change from baseline performance metric. A significant difference among the 3, 5, and 7 Gz plateaus, and SACM 7 Gz plateau p0.0013 Greenhouse-Geisser epsilon0.69, adjusted p0.0053. Two-tailed t-tests using the subject means revealed that the 5 Gz p0.0274, 7 Gz p0.0037, and SACM 7 Gz p0.0005 plateau means to be significantly different from zero. Conclusions A pilots perception of dynamic target position may be compromised during exposure to low and moderate Gz acceleration.
- Target Direction, Range and Position Finding