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The impact of visuo-spatial number forms on simple arithmetic.

Jamie Ward1, Noam Sagiv, Brian Butterworth

  • 1Department of Psychology, University of Sussex, Brighton, UK. jamiew@sussex.ac.uk

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|July 28, 2009
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Summary

Individuals with number forms, a visual-spatial representation of numbers, showed slower multiplication but not subtraction. This suggests number forms impact verbal fact retrieval more than spatial calculation in numerical cognition.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Numerical Cognition

Background:

  • Number forms are conscious visuo-spatial representations of number sequences, present in ~12% of the population.
  • The role of number forms in numerical cognition remains poorly understood.
  • Existing research suggests multiplication relies on verbal fact retrieval, while subtraction uses spatial 'mental number line' calculations.

Purpose of the Study:

  • To investigate the impact of number forms on numerical cognition.
  • To contrast the performance of individuals with and without number forms on multiplication, subtraction, and addition tasks.
  • To determine if visuo-spatial strategies associated with number forms disproportionately affect multiplication compared to subtraction.

Main Methods:

  • Speeded performance tasks involving single-digit multiplication, subtraction, and addition.
  • Comparison between a group of individuals with number forms and a control group.
  • Analysis of performance differences based on numerical task type.

Main Results:

  • Individuals with number forms exhibited slower performance on multiplication tasks compared to controls.
  • Performance on subtraction and addition tasks did not show significant differences between groups.
  • Multiplication was disproportionately affected in individuals with number forms relative to subtraction.

Conclusions:

  • Number forms appear to influence numerical cognition by impacting verbal fact retrieval more than spatial calculation.
  • Visuo-spatial strategies associated with number forms may hinder performance on tasks relying on rote memorization, like multiplication.
  • Further research is needed to fully elucidate the cognitive mechanisms underlying number forms and their impact on mathematical abilities.