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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Sensory Perception

Background:

  • Multisensory perception enhances sensory information processing in daily life.
  • The role of attention in multisensory integration, particularly for distractors, remains debated.
  • Previous research often confounds target processing with attention, necessitating studies on distractor processing.

Purpose of the Study:

  • To investigate whether attention is necessary for multisensory integration of distractors.
  • To determine how spatial attention influences the processing of multisensory distractors.
  • To differentiate feature-level versus configuration-level processing of attended versus unattended distractors.

Main Methods:

  • A multisensory flanker task was designed with both target and distractor stimuli.
  • Congruency between auditory and visual features of stimuli was orthogonally manipulated.
  • Participants' gaze (overt attention) was manipulated to focus on either the target or distractor.

Main Results:

  • Distractor congruency effects were significantly modulated by the focus of attention.
  • Fixating distractors resulted in crossmodal congruency effects, integrating auditory and visual features.
  • When distractors were not fixated, congruency effects were independent, suggesting feature-level processing.

Conclusions:

  • Multisensory integration of irrelevant stimuli is dependent on the focus of spatial attention.
  • Attended distractors are processed as a configuration of features, while unattended distractors are processed at the feature level.
  • These findings clarify the role of attention in shaping multisensory distractor processing.