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Attention does not spread automatically along objects: Evidence from the pupillary light response.

Felipe Luzardo1, Wolfgang Einhäuser2, Monique Michl2

  • 1School of Psychological Sciences, Institute of Information Processing and Decision Making, University of Haifa.

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Attention does not automatically spread along objects. Instead, attentional spreading is guided by learned cue-target relationships, as measured by pupillary responses.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Visual Attention

Background:

  • Objects influence how attention is allocated.
  • Previous research shows faster reactions to targets within a cued object, but mechanisms remain debated.
  • The hypothesis of automatic attentional spreading along objects is common but lacks definitive evidence.

Purpose of the Study:

  • To investigate the mechanisms of object-based attention.
  • To test whether attention automatically spreads along cued objects.
  • To examine the role of cue-target contingencies in attentional spreading.

Main Methods:

  • Utilized pupillary light response modulation as a continuous, response-free measure of attentional allocation.
  • Designed experiments where target probability varied to either encourage or discourage attentional spreading.
  • Incorporated luminance gradients on objects to track attention via pupillary responses.

Main Results:

  • Unequivocal evidence for attentional spreading was observed only when spreading was encouraged by experimental design.
  • Findings did not support the hypothesis of automatic attentional spreading.
  • Pupil size variations indicated attention spread towards darker areas when encouraged, not automatically.

Conclusions:

  • Attentional spreading along objects is not an automatic process.
  • Attentional spreading is actively guided by learned cue-target contingencies.
  • Pupillometry is a viable method for measuring attentional allocation dynamics.