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Color vision with rapid-onset acceleration.

U I Balldin1, G Derefeldt, L Eriksson

  • 1FOI, Swedish Defence Research Agency, formerly National Defence Research Establishment, FOA, Sweden. ulf.balldin@brooks.af.mil

Aviation, Space, and Environmental Medicine
|January 28, 2003
PubMed
Summary
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Color vision remained stable under high G-force exposure. While some hue shifts were noted, particularly with yellow at +9 Gz, overall color perception was not significantly impacted by rapid onset G-loads.

Area of Science:

  • Aerospace Medicine
  • Human Factors Engineering
  • Visual Perception

Background:

  • Limited data exists on color perception changes during high G-force exposure.
  • Understanding visual system responses to G-loads is critical for aviation safety.

Purpose of the Study:

  • To investigate the impact of rapid onset high G-force (+Gz) on color vision.
  • To determine if hue perception is altered under these conditions.

Main Methods:

  • Ten male subjects (9 normal color vision, 1 protanomalous) were exposed to +3, +5, +7, and +9 Gz in a centrifuge.
  • Color stimuli (yellow, red, blue, green, gray) were presented, and subjects orally reported perceived hues.
  • Anti-G suits and straining maneuvers were used to maintain vision.

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Main Results:

  • Subjects correctly identified colors in 96.6% of exposures.
  • Hue shifts occurred in 7.7% of +9 Gz exposures, most often with yellow.
  • Despite occasional hue shifts, statistical analysis showed no significant effect of +Gz load on color identification.

Conclusions:

  • Absolute color identification was stable and not significantly affected by rapid onset +Gz loads up to +9 Gz.
  • While some subjects reported hue changes, these did not reach statistical significance across the group.