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The SNARC effect in two dimensions: Evidence for a frontoparallel mental number plane
Philipp Nikolaus Hesse1, Frank Bremmer1
1Neurophysics, Philipps-Universität Marburg, Marburg, Germany.
Vision Research
|November 13, 2016
Summary
Researchers found a spatial numerical association of response codes (SNARC) effect along horizontal and vertical axes. This suggests a 3D mental number space, with small numbers left/down and large numbers right/up.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Spatial Cognition
Background:
- The spatial numerical association of response codes (SNARC) effect demonstrates a link between number magnitude and spatial representation.
- Previous research established the SNARC effect along cardinal axes and a transverse plane, suggesting a mental number line or plane.
Purpose of the Study:
- To investigate the SNARC effect along horizontal (HM) and vertical meridians (VM) and diagonal axes using saccadic responses.
- To determine if a 3D mental number space exists and how it is organized.
Main Methods:
- Participants performed parity judgments on numbers presented visually or auditorily.
- Saccadic eye movements were used to measure reaction times and spatial responses.
- SNARC effects were analyzed along HM, VM, and diagonal axes, with linear regression used for prediction.
Main Results:
- A significant SNARC effect was observed along both HM and VM.
- The SNARC effect on diagonal axes could be predicted by the HM and VM effects.
- Modality differences in SNARC strength were significant.
Conclusions:
- The findings support a frontoparallel mental number plane where small numbers are left/down and large numbers are right/up.
- These results, combined with previous work, provide evidence for a three-dimensional mental number space.
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