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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Mathematical Cognition

Background:

  • Symbolic number processing is crucial for mathematical competence.
  • The exact mechanism linking number symbols to quantity representations is debated.
  • Current theories include mapping onto approximate number systems or exploiting primal size processing systems.

Purpose of the Study:

  • To investigate the interaction between symbolic number perception and physical size perception.
  • To rigorously test alternative hypotheses regarding the underlying mechanisms of symbolic number processing.

Main Methods:

  • Utilized two psychophysical methods to examine the interplay between symbolic numbers and size perception.
  • Designed experiments to measure the perceived size of numbers based on their symbolic value.

Main Results:

  • Symbolic numerical values induced a significant size illusion.
  • Larger symbolic numbers were perceived as physically larger, and smaller numbers as smaller.
  • This demonstrates a direct influence of numerical magnitude on spatial size perception.

Conclusions:

  • Findings challenge the dominant view of number symbol mapping.
  • Support the alternative hypothesis that size processing systems are involved in symbolic number representation.
  • Propose a novel approach to understanding symbolic numerical processing and its evolutionary origins.