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Related Experiment Video

Updated: Jun 28, 2025

Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments
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Does Boundary Extension Need Attention?

Florence Gaudouin1, Emmanuelle Ménétrier2, André Didierjean1

  • 1Laboratoire de Psychologie EA 3188, Université de Franche-Comté, Besançon, France.

Experimental Psychology
|April 11, 2024
PubMed
Summary

Boundary extension (BE), the tendency to remember more than what is perceived, is eliminated when attention is divided during scene construction. Reduced attention during image viewing prevents this memory enhancement effect.

Keywords:
boundary extensiondivided attentionscene constructionscene memory

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Area of Science:

  • Cognitive Psychology
  • Visual Memory

Background:

  • Boundary extension (BE) describes the phenomenon where memory for visual scenes extends beyond the original boundaries.
  • The role of attention in BE is not well understood, despite attention's importance in memory formation.

Purpose of the Study:

  • To investigate whether reduced attention to a picture benefits or hinders boundary extension (BE).

Main Methods:

  • Participants performed a BE task under single-task (full attention) and dual-task (divided attention) conditions.
  • Scene construction was monitored during the BE task.

Main Results:

  • Boundary extension (BE) was significantly reduced or eliminated under dual-task conditions compared to single-task conditions.
  • Divided attention at the onset of scene construction abolished the BE effect.

Conclusions:

  • Attention is crucial for boundary extension (BE).
  • BE does not benefit from divided attention; rather, it requires focused attention during the initial scene construction phase.