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Related Experiment Videos

Factoring handedness data: I. Item analysis

H B Messinger1, M I Messinger

  • 1New England Medical Computing, Winchester, MA 01890, USA.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|December 1, 1995
PubMed
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To avoid bimodal handedness data, use Oldfield's questionnaire format and strict instructions. This method ensures unimodal distributions, addressing concerns about separate right- and left-handedness studies.

Area of Science:

  • Neuroscience
  • Psychology
  • Human Behavior

Background:

  • Factor analyses of handedness data can be problematic if data is bimodal.
  • Peters and Murphy suggested studying right- and left-handers separately.

Purpose of the Study:

  • To investigate methods for avoiding bimodality in handedness data.
  • To determine if specific questionnaire formats and instructions can yield unimodal distributions.

Main Methods:

  • Utilized Oldfield's original ten-item handedness questionnaire in a 1984 Boston survey.
  • Applied a two-column LEFT-RIGHT format and Oldfield's Admonition for instructions.
  • Reflected the five-point item scale and applied a logarithmic transformation.

Main Results:

Related Experiment Videos

  • The original Oldfield questionnaire produced unimodal item distributions.
  • Modifications to the questionnaire format and instructions in other surveys resulted in bimodal or multimodal distributions.

Conclusions:

  • Oldfield's specific questionnaire format and strict instructions are crucial for achieving unimodal handedness data.
  • Proper methodology can overcome objections to factor analyses on handedness data, avoiding the need to study right- and left-handers separately.