Occluded information is restored at preview but not during visual search

Area of Science:

• Cognitive Psychology
• Visual Perception
• Object Recognition

Background:

• Objects in the real world are frequently partially occluded.
• Amodal completion uses local shape features to fill in missing information before attention.
• Prior knowledge of common objects may influence visual perception beyond amodal completion.

Purpose of the Study:

• To investigate whether knowledge of realistic objects can restore missing visual information during search previews.
• To determine if this restoration process influences visual search guidance.
• To differentiate between preattentive and attentive object restoration mechanisms.

Main Methods:

• Systematic variation of target occlusion during preview and search displays in a visual search task.
• Measurement of button-press response times for target verification.
• Assessment of visual search guidance effectiveness across different occlusion conditions.

Main Results:

• Longest response times occurred when the preview was unoccluded and the target occluded in the search display, suggesting target verification uses visible preview features.
• Visual search guidance was weakest when the target was occluded in the search display, irrespective of preview occlusion.
• This pattern indicates that missing preview information was restored and used for search guidance, causing a feature mismatch.

Conclusions:

• Realistic object knowledge facilitates the restoration of occluded information during search target previews.
• This object restoration occurs even in non-amodal completion contexts.
• The restoration process is not preattentive and likely occurs during attentive processing of the preview.