Bottom-up and top-down attentional contributions to the size congruity effect

Area of Science:

• Cognitive Psychology
• Perception and Attention

Background:

• The size congruity effect describes the interaction between numerical and physical digit sizes.
• Previous theories debated whether this effect occurs early in processing or late in decision-making.

Purpose of the Study:

• To investigate the role of attention in the size congruity effect using a visual search paradigm.
• To test the hypothesis that top-down attention plays a central role in this phenomenon.

Main Methods:

• Experiments manipulated top-down attention through task instructions.
• Feature salience was manipulated using target color and display density (three-digit numerals).
• Visual search tasks assessed numerical and physical size comparisons.

Main Results:

• Task instructions significantly impacted the size congruity effect.
• A unique target color abolished the effect, while increased display density amplified it for numerical search.
• Numerical size comparisons showed a larger effect than physical size comparisons.

Conclusions:

• Top-down attention plays a substantial role in the size congruity effect.
• Findings support a shared-decision account of the size congruity effect.