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Single-digit and two-digit Arabic numerals address the same semantic number line.
1Department of Experimental Psychology, University of Gent, Belgium. bert.reynvoet@rug.ac.be
Cognition
|December 20, 1999
Summary
This study provides evidence that single-digit and two-digit numbers are represented on the same abstract number line. This suggests a continuous representation of numerical magnitude in the human brain.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Human Number Representation
Background:
- Theories of number representation often propose a central semantic system with magnitude information.
- This system is conceptualized as an abstract, compressed number line.
- Direct evidence for units and teens on the same number line is lacking.
Purpose of the Study:
- To investigate whether single-digit (units) and two-digit (teens) numbers share a common representation.
- To test the hypothesis that units and teens are part of a continuous number line.
Main Methods:
- Two masked priming experiments were conducted.
- Participants performed number naming and parity judgment tasks.
- Arabic numerals were used as stimuli, varying in digit count and numerical distance.
Main Results:
- Single-digit and two-digit numerals showed equivalent priming effects regardless of digit count.
- Priming was consistent for equally distant numerals (e.g., 7 priming 9, and 11 priming 9).
Conclusions:
- The findings support the hypothesis of a continuous number line encompassing both units and teens.
- This suggests a unified representation of numerical magnitude in the human brain.