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Using Looming Visual Stimuli to Evaluate Mouse Vision
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Top-down and bottom-up competition in visual stimuli processing.

Tomasz S Ligeza1, Agnieszka D Tymorek2, Mirosław Wyczesany2

  • 1Psychophysiology Laboratory, Institute of Psychology Jagiellonian University, Kraków, Poland; tomasz.ligeza@uj.edu.pl.

Acta Neurobiologiae Experimentalis
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Attention involves a competition between automatic bottom-up processing and volitional top-down processing. This study found a trade-off: increased bottom-up attention decreased top-down processing, and vice versa, confirming attentional competition.

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Area of Science:

  • Cognitive Neuroscience
  • Visual Attention Research

Background:

  • Limited attention capacity means not all visual stimuli are processed equally.
  • Bottom-up attention automatically boosts salient stimuli processing.
  • Top-down attention voluntarily boosts task-relevant stimuli processing.

Purpose of the Study:

  • To examine the competition between bottom-up and top-down attention.
  • To investigate how manipulating one type of attention affects the other.

Main Methods:

  • Used behavioral and electrophysiological measures (ERPs).
  • Participants responded to letters superimposed on background pictures.
  • Manipulated top-down attention via letter task difficulty and bottom-up attention via picture salience.

Main Results:

  • Evoked response potentials (ERPs) and behavioral data revealed a trade-off between attention types.
  • Decreased bottom-up processing correlated with increased top-down processing.
  • Decreased top-down processing correlated with increased bottom-up processing.

Conclusions:

  • Results confirm a competitive relationship between bottom-up and top-down attention.
  • Attentional resources are divided between automatic and volitional processing demands.