Irrelevant sights and sounds require spatial suppression: ERP evidence.

Area of Science:

• Cognitive Psychology
• Neuroscience
• Human-Computer Interaction

Background:

• Irrelevant stimuli can disrupt primary tasks, but whether this involves spatial attention competition is debated.
• Existing research often uses task-relevant distractors or is limited to the visual domain.

Purpose of the Study:

• To investigate if task-irrelevant visual, auditory, and multisensory distractors compete for spatial attention.
• To identify electrophysiological markers of attentional capture by different distractor types.
• To test if multisensory distractors have a unique ability to capture attention.

Main Methods:

• Behavioral and electroencephalography (ERP) measurements during a central visual search task.
• Presentation of lateralized visual, auditory, or multisensory distractors.
• Analysis of event-related potentials (ERPs) for components like P_D and P_AD.

Main Results:

• Visual and multisensory distractors elicited the P_D component, indicating spatial suppression.
• An auditory analog of P_D, termed P_AD, was identified for auditory and multisensory distractors.
• No evidence supported enhanced attentional competition from multisensory distractors.

Conclusions:

• Both unisensory and multisensory irrelevant distractors can elicit an 'attend-to-me' signal, a precursor to spatial attentional capture.
• Multisensory distractors do not possess a unique saliency that enhances attentional capture compared to unisensory distractors.
• The findings challenge theories predicting attention competition should not occur with irrelevant stimuli.