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Flash-and-Freeze: A Novel Technique to Capture Membrane Dynamics with Electron Microscopy
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The flash grab effect.

Patrick Cavanagh1, Stuart Anstis

  • 1Laboratoire Psychologie de la Perception, Université Paris Descartes, Centre Biomédical des Saints Pères, 45 rue des Saints Peres, Paris 75006, France.

Vision Research
|July 23, 2013
PubMed
Summary
This summary is machine-generated.

Visual perception shortens moving object trajectories. A flashed bar at the object's physical endpoint is "grabbed" and perceived at the shortened endpoint, demonstrating a new attention-dependent "flash grab" effect.

Keywords:
AttentionFlash-drag effectMotionPosition

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Area of Science:

  • Visual Perception
  • Motion Perception
  • Psychophysics

Background:

  • Objects moving back and forth are perceived to have shorter trajectories than their physical path.
  • This perceived shortening involves an apparent averaging of location over a temporal window.
  • Previous research (Sinico et al., 2009) has explored motion-induced position shifts.

Purpose of the Study:

  • To investigate a novel phenomenon where a flashed visual stimulus is perceptually shifted by a moving object's trajectory.
  • To determine the characteristics and underlying mechanisms of this 'flash grab' effect.
  • To differentiate this effect from existing motion-induced position shifts like 'flash drag'.

Main Methods:

  • Participants viewed a moving object and a flashed bar presented at its physical reversal point.
  • The perceived location of the flashed bar was recorded under varying object speeds and stimulus parameters.
  • Experiments manipulated the presence of the flash, its spatiotemporal proximity to the object, and the requirement of attention.

Main Results:

  • A flashed bar presented at the object's physical endpoint is perceived as shifted towards the object's perceived endpoint.
  • This 'flash grab' effect is generated by the perceived trajectory shortening and occurs within a spatiotemporal attraction zone.
  • The effect scales with speed, is independent of contrast above 5%, and crucially requires visual attention.

Conclusions:

  • A new motion-induced position shift, termed 'flash grab', has been identified.
  • This effect demonstrates that attention plays a critical role in integrating flashed stimuli with perceived motion trajectories.
  • Flash grab differs significantly from flash drag in its temporal profile, attentional requirements, and magnitude.