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Large-scale Three-dimensional Imaging of Cellular Organization in the Mouse Neocortex
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Self-Other Differentiation Scale: Dimensionality, IRT Parameterization, and Measurement Invariance.

Sonia Ingoglia1, Palmira Faraci2, Pasquale Musso1

  • 1a Department of Psychology and Educational Sciences , Università degli Studi di Palermo , Palermo , Italy.

The Journal of Genetic Psychology
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Summary

The Self-Other Differentiation Scale effectively measures an individual's distinct sense of self. This validated scale demonstrates reliability and consistency across genders, supporting its use in psychological research.

Keywords:
Measurement invariancemultiple-group categorical confirmatory factor analysisscale validationself-other differentiation

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Area of Science:

  • Psychology
  • Social Psychology
  • Personality Psychology

Background:

  • The Self-Other Differentiation Scale (SODS) is a key instrument for assessing the psychological construct of self-other differentiation.
  • Understanding how individuals perceive their distinctiveness from others is crucial in various psychological contexts.

Purpose of the Study:

  • To investigate the psychometric properties of the Self-Other Differentiation Scale.
  • To examine the scale's dimensionality, internal consistency, and measurement invariance across gender.

Main Methods:

  • The study involved three independent samples totaling 1,754 participants aged 17–30 years.
  • Participants completed the Self-Other Differentiation Scale as part of the data collection.

Main Results:

  • Factor analysis supported a single-factor structure for the scale.
  • The scale demonstrated appropriate internal consistency and partial measurement invariance across gender.
  • Evidence was found for a reliable 10-item version of the scale.

Conclusions:

  • The Self-Other Differentiation Scale is a psychometrically sound instrument for measuring self-other differentiation.
  • The scale's invariance across gender supports its broad applicability in diverse populations.
  • A concise 10-item version offers a practical alternative for assessment.