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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Visual Perception

Background:

  • Visual attention is influenced by past encounters and learned probabilities.
  • Previous research suggested spatial suppression of high-probability distractor locations in visual search.
  • Alternative hypotheses proposed facilitation at low-probability locations or confounding target probabilities.

Purpose of the Study:

  • To investigate the underlying mechanisms of spatial suppression in visual attention.
  • To test whether attentional selection is facilitated at low-probability distractor locations.
  • To differentiate between target probability bias and distractor probability bias effects.

Main Methods:

  • Two visual search experiments were conducted.
  • Experiment 1 manipulated target probabilities while keeping distractor probabilities equal.
  • Experiment 2 manipulated distractor probabilities while keeping target probabilities equal.

Main Results:

  • No evidence for spatial suppression was found when only target probabilities were biased.
  • Spatial suppression persisted when only distractor probabilities were biased and target probabilities were equal.
  • Findings did not support the hypothesis of facilitated selection at low-probability distractor locations.

Conclusions:

  • Recurrent distractor presentation at a specific location induces attentional suppression of that location.
  • This suppression mechanism is independent of regularities in target position.
  • The study refutes the alternative interpretation of facilitated selection at low-probability locations.