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Related Experiment Videos

Type II errors in comparisons of dextral and sinistral groups

J T Sappington1

  • 1Department of Psychology, Augusta State University, GA 30910, USA.

Perceptual and Motor Skills
|June 1, 1997
PubMed
Summary

Anomalous cerebral dominance, indicated by factors beyond just handedness, is more prevalent than previously thought. Relying solely on handedness may lead to inaccurate research findings regarding brain lateralization.

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Area of Science:

  • Neuroscience
  • Human Biology
  • Cognitive Science

Background:

  • Anomalous cerebral dominance presents in various forms, including non-right-handedness.
  • Prevalence estimates for anomalous dominance vary significantly based on diagnostic criteria.

Purpose of the Study:

  • To highlight the limitations of using only handedness as a proxy for cerebral dominance.
  • To address the potential for Type II errors in research due to narrow definitions of dominance.

Main Methods:

  • Review of existing literature on cerebral dominance and handedness.
  • Analysis of prevalence estimates from Geschwind and Behan (1987).

Main Results:

  • Anomalous dominance, considering factors beyond handedness, may affect up to 30% of the population.
  • Excluding non-handedness indicators leads to underestimation of anomalous dominance.

Conclusions:

  • Handedness alone is an insufficient measure for assessing cerebral dominance.
  • Broader criteria are needed to accurately study brain lateralization and its effects.

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