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Freya Festl1, Fabian Recktenwald, Chunrong Yuan

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Area of Science:

  • Visual perception
  • Motion perception
  • Human psychophysics

Background:

  • Humans accurately estimate ego-motion from optic flow, but linear acceleration perception is less understood.
  • Existing studies suggest ego-acceleration is neglected, yet constant perceived speed implies its presence.

Purpose of the Study:

  • To investigate the relationship between ego-acceleration estimates and environmental geometry.
  • To analyze human perception of acceleration in simulated flights through varying corridor types.

Main Methods:

  • Simulated flights through cylindrical and conic (narrowing/widening) corridors.
  • Theoretical analysis of retinal acceleration measurements to derive an acceleration rate (ρ).
  • Comparison of human judgments of ego-acceleration with environmental geometric parameters.

Main Results:

  • Subjects accurately judged ego-acceleration in straight corridors.
  • Systematic confusion observed between ego-acceleration and corridor narrowing, and ego-deceleration and corridor widening.
  • Theoretical acceleration rate (ρ) is independent of scene geometry.

Conclusions:

  • Human ego-acceleration judgments rely on first-order retinal flow.
  • Perception of ego-acceleration does not utilize the derived acceleration rate or retinal acceleration.
  • Environmental geometry significantly influences perceived ego-acceleration, particularly in non-straight paths.