Attentional Capture to a Singleton Distractor Degrades Visual Marking in Visual Search

Area of Science:

• Cognitive Psychology
• Neuroscience
• Visual Perception

Background:

• Visual search efficiency is enhanced when distractors are previewed, an effect known as the preview benefit.
• A memory template is hypothesized to aid the preview benefit by marking previously occupied distractor locations.
• The impact of salient distractors on this preview benefit remains unclear.

Purpose of the Study:

• To investigate whether a singleton distractor affects the preview benefit in visual search.
• To determine if attentional capture by a singleton interacts with the visual marking mechanism.

Main Methods:

• Combined a preview search paradigm with a conventional visual search paradigm incorporating a singleton distractor.
• Measured reaction times as a function of set size in the presence and absence of a singleton distractor.
• Assessed attentional capture by singletons in a separate simultaneous search experiment.

Main Results:

• The presence of a singleton distractor steepened the reaction time slope, indicating a reduced preview benefit.
• This reduction in preview benefit correlated positively with the degree of attentional capture by the singleton.
• The findings suggest that visual marking and search processes share common attentional resources.

Conclusions:

• Conspicuous singleton distractors impair the preview benefit in visual search.
• The mechanism underlying the preview benefit is sensitive to attentional capture.
• Visual marking and search likely rely on shared attentional mechanisms.