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Direct evidence for linguistic influences in two-digit number processing.

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Language differences in number words affect how we process numbers. Articulatory suppression eliminated these differences, showing verbal number formation impacts symbolic number processing and interacts with cognitive control.

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Area of Science:

  • Cognitive Psychology
  • Psycholinguistics
  • Numerical Cognition

Background:

  • Language-specific number word structures influence non-verbal numerical tasks.
  • The unit-decade compatibility effect in number comparison is affected by number word inversion (e.g., German 'zweiundvierzig' for 42).

Purpose of the Study:

  • To investigate if cross-linguistic differences in two-digit number processing are driven by number word formation.
  • To examine the role of articulatory suppression in mediating these linguistic influences.

Main Methods:

  • Two studies involving German and English speakers performing a two-digit number comparison task with Arabic digits.
  • Articulatory suppression was employed to block verbal rehearsal.
  • Study 2 additionally manipulated the percentage of within-decade filler items.

Main Results:

  • Between-group differences in the compatibility effect vanished under articulatory suppression.
  • The compatibility effect was larger for German speakers than English speakers with 20% fillers.
  • This pattern reversed with 50% fillers, indicating an interaction between linguistic and cognitive control factors.

Conclusions:

  • Provides direct evidence that verbal number word formation influences symbolic number processing.
  • Suggests an interaction between linguistic influences and cognitive control processes related to stimulus set characteristics.