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Related Experiment Video

Updated: Jun 12, 2026

Multimedia Battery for Assessment of Cognitive and Basic Skills in Mathematics (BM-PROMA)
10:58

Multimedia Battery for Assessment of Cognitive and Basic Skills in Mathematics (BM-PROMA)

Published on: August 28, 2021

Position coding in two-digit arabic numbers.

Javier García-Orza1, Manuel Perea

  • 1Departamento de Psicología Básica, Facultad de Psicología Campus de Teatinos, s/n 29071 Málaga, Spain. jgorza@uma.es

Experimental Psychology
|May 25, 2010
PubMed
Summary
This summary is machine-generated.

The position of digits in two-digit numbers is not fixed during early visual processing. This challenges models of Arabic number recognition, suggesting flexible digit representation.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Computational Linguistics

Background:

  • Understanding how the brain processes numerical information is crucial for cognitive science.
  • Previous research on letter position coding suggests positional information is rapidly encoded.
  • The specific mechanisms of digit position coding in Arabic numerals remain less understood.

Purpose of the Study:

  • To investigate whether digit position is explicitly coded in early visual processing of two-digit Arabic numbers.
  • To determine if the spatial location of digits influences their recognition.
  • To test the implications for computational models of number processing.

Main Methods:

  • Two masked priming experiments were conducted using two-digit Arabic numbers.
  • Experiment 1 used a number/non-number decision task with primes sharing digits in the same or different positions, or transposed digits.
  • Experiment 2 utilized a masked priming same-different matching task to assess response times.

Main Results:

  • Experiment 1 revealed priming effects only when primes and targets shared digits in the identical position.
  • Experiment 2 demonstrated faster response times for shared digits, including transposed ones, compared to controls.
  • These findings suggest digit identity, not specific position, is prioritized in early visual stages.

Conclusions:

  • The identity of digits in two-digit numbers is processed independently of their specific positional information at early visual processing stages.
  • Current models of Arabic number processing may need revision to account for this flexible positional coding.
  • This research contributes to understanding the fundamental principles of numerical cognition and visual perception.