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Martin Riemer1, Daniel Bratzke2, Lars Michael3

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Brain representations of time and space are debated. This study shows speed, not hierarchy, causes asymmetric space-time interference in perception experiments.

Keywords:
Space-time interferenceSpace–time asymmetrySpeedVelocity

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Area of Science:

  • Cognitive Neuroscience
  • Psychology
  • Perception

Background:

  • The brain's representation of time and space is debated, with theories suggesting a generalized magnitude system or temporal representations based on spatial ones.
  • Asymmetric space-time interference, where time perception is more affected by space than vice versa, is often seen as evidence for a hierarchical structure.

Purpose of the Study:

  • To investigate the role of stimulus speed in asymmetric space-time interference.
  • To determine if speed processing, rather than a hierarchical structure, underlies observed asymmetries in space-time perception.

Main Methods:

  • Two experiments were conducted comparing duration and length judgments.
  • Stimuli included static, growing, and shrinking lines to manipulate speed and spatial extent.
  • Judgments of line length and duration were analyzed for interference effects.

Main Results:

  • Introducing speed increased space-time interference, particularly the space-on-time effect, enhancing asymmetry.
  • Reversing the correlation between line length and speed (shorter lines with higher speed) reversed the space-on-time effect.

Conclusions:

  • Asymmetric space-time interference in dynamic stimuli experiments is primarily driven by the processing of speed.
  • The findings do not support a hierarchical representational structure for space and time in the brain.