The capacity limitations of multiple-template visual search during task preparation and target selection

Area of Science:

• Cognitive Neuroscience
• Visual Perception

Background:

• Visual search relies on preparatory activation of attentional templates.
• The capacity of concurrent attentional templates and associated costs are not well understood.

Purpose of the Study:

• To investigate the number of concurrently maintained attentional templates during visual search.
• To examine the performance costs associated with multiple-template versus single-template visual search.

Main Methods:

• Compared three-color and single-color search tasks.
• Measured event-related potentials (N2pc component) using task-irrelevant color probes to track template activation.
• Analyzed attentional guidance and search performance.

Main Results:

• In predictable three-color search, only one template was active.
• In unpredictable three-color search, all three templates were concurrently active.
• Multiple-template search showed costs in attentional guidance and performance, linked to template inhibition.

Conclusions:

• At least three attentional templates can be maintained in parallel.
• Multiple-template search is limited by capacity, impacting attentional guidance and target selection.
• Inhibitory interactions between active templates contribute to search costs.