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  1. Home
  3. The Bookend Effect.
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  3. The Bookend Effect.

Related Experiment Video

Training Synesthetic Letter-color Associations by Reading in Color
10:27

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Published on: February 21, 2014

The bookend effect.

Anna Riga1, Stuart Anstis2, Patrick Cavanagh3,4,5

  • 1University of Malta, Malta.

I-Perception
|March 4, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

Objects moving together are grouped, but conflicting illusory paths disrupt this. Salient "bookend" elements capture perceived group motion, overriding inner elements with different illusory paths, demonstrating visual grouping dominance.

Keywords:
crowdingframe effectfurrow illusiongroupingperceptual organizationvisual illusions

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Area of Science:

  • Visual perception
  • Gestalt principles
  • Motion perception

Background:

  • The principle of common fate suggests objects moving together are perceived as a group.
  • Illusory motion can arise from static visual stimuli, such as oblique gratings causing the furrow illusion.

Purpose of the Study:

  • To investigate how conflicting illusory motion paths affect the perception of group motion.
  • To determine the influence of salient elements on perceived group direction when visual cues diverge.

Main Methods:

  • Presenting horizontally aligned targets moving vertically over static background gratings with varying orientations.
  • Manipulating background orientation between outer ('bookend') and inner ('book') targets to create conflicting illusory paths.

Main Results:

  • When all background gratings shared the same orientation, group motion aligned with the furrow illusion.
  • When outer targets had different background orientations than inner targets, perceived group motion was dominated by the outer targets.
  • Inner targets' discriminable features and relative motion were insufficient to alter perceived group direction.

Conclusions:

  • Spatial proximity and common motion create a unified object representation, prioritizing salient features.
  • Dominant visual cues, like the motion of salient 'bookend' elements, override conflicting illusory motion information from inner elements.
  • Perception of group motion is susceptible to the influence of visually dominant components, even when other cues suggest different motion paths.