Spacing and Presentation Modes Affect the Unit-Decade Compatibility Effect During Number Comparison

Area of Science:

• Cognitive Psychology
• Numerical Cognition
• Human Perception

Background:

• The unit-decade compatibility effect challenges holistic number processing models, supporting decomposed processing of multi-digit numbers.
• Evidence suggests decomposed processing of decade and unit magnitudes occurs in parallel.
• The presentation mode of multi-digit numbers might influence processing (holistic vs. decomposed, parallel vs. sequential).

Purpose of the Study:

• To investigate how presentation mode (vertical, horizontal, consecutive) affects the unit-decade compatibility effect.
• To examine the impact of the distance between vertically presented numbers on this effect.
• To understand how visual factors influence multi-digit number processing.

Main Methods:

• Two studies were conducted using number comparison tasks.
• Participants evaluated the unit-decade compatibility effect under different presentation modes (vertical, horizontal, consecutive).
• The distance between vertically presented numbers was manipulated.

Main Results:

• The unit-decade compatibility effect did not significantly differ between vertical and horizontal presentations.
• The effect was nonsignificant with consecutive number presentation.
• A significantly smaller compatibility effect was observed when numbers were spaced further apart.

Conclusions:

• Stimulus size and inter-stimulus distance affect multi-digit number processing.
• Visual presentation factors, particularly spacing, play a role in the unit-decade compatibility effect.
• Future studies should report stimulus size and distance for clarity in number processing research.