Spatial attention shifts contribute to the size congruity effect

Area of Science:

• Cognitive Psychology
• Neuroscience
• Human Perception

Background:

• The size congruity effect demonstrates an interaction between numerical and physical magnitudes.
• Spatial shifts of attention have been proposed as a mechanism underlying this effect.
• Previous research has not fully established the role of attention in the size congruity effect.

Purpose of the Study:

• To investigate the contribution of spatial attention shifts to the size congruity effect.
• To provide further evidence for the attentional explanation of the size congruity effect.
• To examine how presentation mode (simultaneous vs. sequential) influences the size congruity effect.

Main Methods:

• Participants performed magnitude judgments on numerical or physical dimensions of number pairs.
• Number pairs were presented either simultaneously or sequentially.
• Numerical and physical magnitudes of the numbers varied independently.

Main Results:

• The size congruity effect was consistently reduced or eliminated in the sequential presentation condition compared to the simultaneous condition.
• Sequential presentation precluded spatial attention shifts by presenting numbers centrally and successively.
• Simultaneous presentation allowed for spatial attention shifts between the numbers.

Conclusions:

• Spatial shifts of attention play a significant role in generating the size congruity effect.
• The findings support the attentional explanation for the interaction between numerical and physical magnitudes.
• Manipulating presentation mode can modulate the influence of spatial attention on magnitude judgments.