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The laterality effect: myth or truth?

Roi Cohen Kadosh1

  • 1Institute of Cognitive Neuroscience and Department of Psychology, University College London, London WC1N 3AR, UK. r.cohenkadosh@ucl.ac.uk

Consciousness and Cognition
|June 6, 2007
PubMed
Summary
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The laterality effect, previously unexplained, influences automatic numerical processing. This study confirms its existence, distinct from the numerical distance effect, impacting cognitive tasks.

Area of Science:

  • Cognitive Psychology
  • Numerical Cognition
  • Experimental Psychology

Background:

  • The laterality effect suggests automatic classification of numbers as small/large relative to a standard point during numerical information processing.
  • Previous research by Tzelgov et al. (1992) proposed the laterality effect as a post-hoc explanation, but its validity was not independently verified and was potentially confounded with the numerical distance effect.

Purpose of the Study:

  • To rigorously examine the genuineness of the laterality effect in automatic numerical processing.
  • To differentiate the laterality effect from the numerical distance effect.

Main Methods:

  • Experimental design controlling for the numerical distance effect.
  • Paradigms designed to elicit automatic numerical processing.

Related Experiment Videos

Main Results:

  • The laterality effect was confirmed to exist independently of the numerical distance effect.
  • The laterality effect significantly influences the processing of automatic numerical information.

Conclusions:

  • The laterality effect is a genuine phenomenon affecting automatic numerical processing.
  • Researchers utilizing paradigms involving automatic numerical processing (e.g., Stroop-like, priming tasks) should account for the laterality effect.