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Apparent shift in long-range motion trajectory by local pattern orientation.

Ryohei Nakayama1, Daisuke Harada2,3, Miyuki G Kamachi2

  • 1The University of Tokyo, Tokyo, Japan. ryouhei.nakayama@gmail.com.

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|January 17, 2018
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Summary
This summary is machine-generated.

The perceived motion direction of visual patterns shifts towards their orientation. This orientation-induced motion bias is influenced by apparent, not physical, orientation, impacting visual processing.

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Area of Science:

  • Visual perception
  • Neuroscience
  • Cognitive psychology

Background:

  • The perception of motion is fundamental to visual processing.
  • Understanding how visual cues interact to determine perceived motion direction is crucial.
  • Previous research suggests motion perception involves complex neural computations.

Purpose of the Study:

  • To investigate the influence of pattern orientation on the perceived direction of motion.
  • To determine if the perceived orientation or physical orientation of a stimulus drives motion shifts.
  • To explore the role of stimulus envelope orientation in motion perception.

Main Methods:

  • Presenting Gabor gratings moving in discrete steps with blank inter-stimulus intervals (ISIs).
  • Measuring the perceived direction of motion and comparing it to the physical trajectory.
  • Employing orientation adaptation paradigms to probe the role of apparent orientation.
  • Investigating the effect of the contrast-defined stimulus envelope's orientation.

Main Results:

  • Perceived motion direction of a Gabor grating is systematically biased towards its orientation.
  • This orientation-induced motion shift is strongest for orientations approximately ±15 degrees from the physical motion path.
  • The bias is dependent on the apparent orientation of the grating, not its physical orientation.
  • The orientation of the stimulus envelope also influences the directional motion shift.

Conclusions:

  • Visual motion perception is significantly influenced by pattern orientation.
  • The perceived trajectory of motion arises from the integration of motion and pattern information at higher visual processing levels.
  • These findings contribute to a deeper understanding of how the brain constructs a coherent visual experience from sensory input.