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Numbers can move our hands: a spatial representation effect in digits handwriting.
Gelsomina Perrone1, Maria Dolores de Hevia, Emanuela Bricolo
1Department of Psychology, University of Milano-Bicocca, Viale dell'Innovazione 10, 20126, Milan, Italy.
Experimental Brain Research
|August 12, 2010
Summary
Number magnitude influences spontaneous handwriting, with smaller numbers written leftward and larger numbers rightward. This spatial mapping effect was observed in number writing but not in letter writing, revealing number-specific motor planning interactions.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Human Motor Control
Background:
- Numerical cognition research explores the link between numbers and action-related processes.
- Investigating number effects on complex motor plans like handwriting is novel.
Purpose of the Study:
- To examine how the spatial mapping of numbers affects spontaneous handwriting.
- To determine if number magnitude influences motor planning in writing.
Main Methods:
- Participants' spontaneous handwriting of digits and letters was recorded using a digitizing tablet.
- Analysis focused on the spatial dislocation of written characters.
Main Results:
- Number writing showed a clear spatial dislocation based on magnitude: small numbers were written leftward, large numbers rightward.
- Letter writing exhibited minimal or no spatial dislocation related to magnitude.
- This indicates number-specific modulation of motor parameters during handwriting.
Conclusions:
- Automatic spatial mapping of numbers interacts with action planning in spontaneous handwriting.
- The findings highlight a unique influence of numerical magnitude on motor execution.
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