Size congruity influences visual search via the target template

Area of Science:

• Cognitive Psychology
• Visual Perception
• Human-Computer Interaction

Background:

• The size congruity effect (SCE) demonstrates faster responses when numerical and physical size align.
• The SCE is typically observed in numerical comparison tasks but has recently appeared in visual search.
• The presence of SCE in visual search suggests numerical size influences attention despite its irrelevance to search tasks.

Purpose of the Study:

• To investigate the mechanisms behind the size congruity effect (SCE) in visual search.
• To test the hypothesis that SCE in visual search arises from comparing attended items to a target template in visual short-term memory.
• To determine how manipulating attention and target templates affects the SCE during visual search.

Main Methods:

• Three experiments were conducted using a visual search paradigm.
• Participants searched for a target digit with distinct numerical and physical sizes from distractors.
• Experimental manipulations included attentional instructions and blocked presentation of target features to alter target template formation.

Main Results:

• Experiment 1 showed the SCE and shallow search slopes, indicating physical size captured attention first.
• Experiment 2, instructing attention to physical size, abolished the SCE, suggesting numerical size was not analyzed.
• Experiment 3, blocking target features, also abolished the SCE, implying template restrictions prevent numerical analysis.

Conclusions:

• The size congruity effect in visual search is linked to the comparison of visual items with a target template in short-term memory.
• Restricting the target template to specific physical features, like shape and physical size, can eliminate the SCE.
• These findings suggest that the SCE in visual search can be mitigated by guiding participants to focus on relevant physical attributes and ignore irrelevant numerical information.