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Area of Science:

  • Neuroscience
  • Human Factors in Space Exploration
  • Bayesian Brain Theory

Background:

  • Gravity provides a strong prior for decision-making, anchoring perception via the vestibular system.
  • Altering this gravitational prior may impact how humans integrate uncertainty and make choices.
  • Understanding these effects is crucial for planning long-duration human space missions.

Purpose of the Study:

  • To investigate the impact of altered gravity on self-motion estimation and decision-making under uncertainty.
  • To explore how microgravity and hypergravity influence confidence judgments in a simulated space environment.

Main Methods:

  • A self-motion estimation task was conducted in a virtual reality space analog environment.
  • Two participants operated drones in simulated Martian orbit during parabolic flights, inducing altered gravity.
  • Participants predicted collisions and reported confidence, with task uncertainty manipulated via trajectory angles.

Main Results:

  • Subjective confidence was negatively predicted by stimulus uncertainty, as expected.
  • Overt behavioral responses (performance, choice) were not differentially affected by gravity conditions alone.
  • Microgravity led to higher subjective confidence, particularly when combined with stimulus uncertainty.

Conclusions:

  • Decision-making under uncertainty is affected differently in microgravity compared to normal gravity.
  • Altered gravity significantly impacts subjective confidence, especially in uncertain situations.
  • Automatized compensatory mechanisms may be necessary to address human factors in microgravity environments for space missions.