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Attentional load interferes with target localization across saccades.

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  • 1School of Psychology, University of Aberdeen, Aberdeen, AB24 3FX, UK.

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Summary

Attention aids spatial memory across eye movements (saccades). High attention is crucial for accurate object localization without visual landmarks, but landmarks can compensate for reduced attention.

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception

Background:

  • Spatial information is maintained across eye movements despite changing retinal input.
  • Understanding the role of attention in trans-saccadic object localization is crucial for explaining seamless spatial awareness.

Purpose of the Study:

  • To investigate how attentional load affects the ability to localize objects across eye movements (trans-saccadic localization).
  • To determine if visual landmarks can mitigate the effects of reduced attention on spatial localization.

Main Methods:

  • Participants performed a target localization task under varying levels of attentional load.
  • Experiments involved saccades between target presentation and localization report.
  • A salient, shifting landmark was introduced in a second experiment to assess its influence.

Main Results:

  • Increased attentional load impaired localization precision when a saccade occurred between target presentation and report.
  • A shifting landmark had a greater impact on localization accuracy under high attentional load compared to low load.
  • Landmarks appear to be more critical for localization when attentional resources are scarce.

Conclusions:

  • Attention actively supports trans-saccadic spatial updating, particularly in the absence of reliable visual cues.
  • The presence of stable visual landmarks can compensate for limited attentional resources in maintaining spatial accuracy across saccades.
  • These findings highlight the interplay between attention, spatial updating, and environmental cues in visual perception.