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Heading perception depends on time-varying evolution of optic flow.

Charlie S Burlingham1, David J Heeger1,2

  • 1Department of Psychology, New York University, New York, NY 10003; charlie.burlingham@nyu.edu david.heeger@nyu.edu.

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Perception of heading during rotation requires more than instantaneous optic flow. Visual systems rely on the evolving optic flow over time, possibly using optic acceleration, for accurate heading judgments.

Keywords:
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Area of Science:

  • Visual perception
  • Neuroscience
  • Computational vision

Background:

  • The perception of heading, crucial for navigation, is hypothesized to be mediated by instantaneous optic flow.
  • However, this hypothesis has not been empirically tested, particularly in the context of rotational motion.

Purpose of the Study:

  • To test the hypothesis that instantaneous optic flow is sufficient for heading perception during rotation.
  • To investigate the role of time-varying optic flow and optic acceleration in heading perception.

Main Methods:

  • Introduction of a novel "nonvarying phase motion" stimulus to present a single, constant optic flow field over time.
  • Conducting a forced-choice heading discrimination task with human observers viewing these stimuli.
  • Comparing performance with stimuli where optic flow velocity varied over time.

Main Results:

  • Observers made significant errors in heading judgments when presented with nonvarying phase motion, indicating instantaneous optic flow is insufficient.
  • Heading discrimination accuracy improved dramatically when the velocity of phase motion was varied, mimicking evolving optic flow fields.
  • This suggests that the temporal evolution of optic flow is critical for accurate heading perception.

Conclusions:

  • Heading perception in the presence of rotation is not mediated by instantaneous optic flow alone.
  • Accurate heading perception relies on the time-varying nature of optic flow, specifically the evolving sequence of flow fields.
  • Optic acceleration (the temporal derivative of optic flow) is hypothesized as the mechanism the visual system uses for robust heading computation during rotation.