Emergent features break the rules of crowding

Area of Science:

• Visual perception
• Cognitive psychology
• Neuroscience

Background:

• Crowding is a phenomenon where surrounding objects (flankers) impair target identification.
• A key principle of crowding is that similarity between target and flankers intensifies this effect.

Purpose of the Study:

• To investigate how emergent features influence visual crowding.
• To determine if emergent features can alter the typical target-flanker similarity rule in crowding.

Main Methods:

• Three experiments were conducted using targets with emergent features (Diamonds and Xs).
• Observers identified targets flanked by similar or dissimilar Diamond and X stimuli.
• Judgments of target conspicuity and display uniformity were assessed.

Main Results:

• Targets with emergent features (Diamonds) were identified better than those without (Xs), even with high target-flanker similarity.
• Display uniformity judgments improved with emergent features, suggesting global processing benefits.
• Perceived target conspicuity did not fully align with identification performance.

Conclusions:

• Emergent features can modulate crowding, challenging the conventional rule that similarity always increases crowding.
• The information content of the entire visual display significantly impacts crowding effects.
• Standard crowding rules may be limited to scenarios with independent target and flanker stimuli.