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A Psychophysics Paradigm for the Collection and Analysis of Similarity Judgments

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Published on: March 1, 2022

Vertical versus horizontal Spatial-Numerical Associations (SNA): A processing advantage for the vertical dimension.

Luke Greenacre¹, Jair E Garcia², Eugene Chan^1,3

¹Faculty of Business and Economics, Monash University, Caulfield East, Victoria, Australia.

|August 25, 2022

Summary

Spatial-Numerical Associations (SNAs) show a vertical rather than horizontal dominance. This suggests vertical number displays may offer advantages for magnitude comparisons, especially in specific professional contexts.

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Area of Science:

Cognitive Psychology
Neuroscience
Human-Computer Interaction

Background:

Humans exhibit Spatial-Numerical Associations (SNAs), linking numbers to physical space.
Previous research explored dominant orientations in SNAs but struggled to isolate spatial access from motor control.
Differentiating number representation from motor response is crucial for understanding SNAs.

Purpose of the Study:

To investigate the dominant orientation of Spatial-Numerical Associations (SNAs).
To disentangle number representation efficiency from motor control in directional SNA tasks.
To examine the influence of language orientation on SNA performance.

Main Methods:

A conflict test was designed using diagonal number pairs for simultaneous horizontal and vertical processing.
Participants identified the larger number in pairs using a unilateral joystick input.
Response accuracy and efficiency were measured across both dimensions.

Main Results:

Directional SNAs demonstrated a vertical rather than horizontal dominance.
Response efficiency, not accuracy, was moderated by the congruence of native language and experimental language orientation (left-to-right).

Conclusions:

Vertical orientation appears dominant in directional SNAs.
Vertical number displays may offer situational benefits for magnitude comparisons.
Language-script orientation can influence SNA response efficiency.