Comparing two-digit numbers: The importance of being presented together

Dana Ganor-Stern, Michal Pinhas, Joseph Tzelgov

Research output: Contribution to journalArticlepeer-review

43 Scopus citations


The effect of presentation mode on magnitude comparisons of two-digit (2D) numbers was examined using the stimuli set developed by Nuerk, Weger, and Willmes (2001). In Experiment 1, only number pairs from difference decades were presented either simultaneously or sequentially. In the former case there was evidence for the parallel processing of both the units and decades digits and for a components representation, consistent with previous findings. In contrast, in the latter case there was evidence for the processing of mainly the decades digits. In Experiment 2, within-decade number pairs were added to make both digits task relevant. The results from the simultaneous condition were again consistent with a components representation, while results from the sequential presentation were in line with a holistic representation, in line with Zhang and Wang's (2005) research. Results therefore suggest that the processing of 2D numbers depends on the way they are presented.

Original languageEnglish
Pages (from-to)444-452
Number of pages9
JournalQuarterly Journal of Experimental Psychology
Issue number3
StatePublished - 8 Jun 2009


  • Automatic numerical processing
  • Numerical cognition
  • Two-digit numbers

ASJC Scopus subject areas

  • Physiology
  • Neuropsychology and Physiological Psychology
  • Experimental and Cognitive Psychology
  • General Psychology
  • Physiology (medical)


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