Attentional guidance by salient feature singletons depends on intertrial contingencies

Area of Science:

• Cognitive Psychology
• Visual Attention

Background:

• Salient feature singletons are thought to guide attention, potentially under top-down control.
• The coincidence rate between targets and singletons influences attentional guidance.
• Intertrial effects can modulate singleton-based attention.

Purpose of the Study:

• To investigate the role of top-down control versus automatic processes in singleton-guided attention.
• To examine how preceding trial types influence singleton-related benefits and costs.
• To test the predictions of dimensional weighting and perceptual priming accounts.

Main Methods:

• Participants performed a visual search task involving salient feature singletons.
• The coincidence rate of singleton-target and singleton-distractor pairings was manipulated.
• The type of the preceding trial was varied to assess intertrial effects.

Main Results:

• Benefits and costs associated with singletons were significantly influenced by the preceding trial type.
• Findings support accounts proposing automatic transfer of dimensional activity across trials (perceptual priming).
• Priming effects were found to be set independently for each stimulus dimension.

Conclusions:

• Singleton-guided attention is not solely under top-down strategic control.
• Automatic perceptual priming mechanisms play a crucial role in modulating singleton effects.
• Dimensional weighting and perceptual priming provide a robust framework for understanding these effects.