Abstract
The Splitting Index (SI), a self-report scale based on the writings of Kernberg (e.g., 1976) on self and object representations and the defense mechanism of splitting, was constructed. After development over the course of 6 pilot studies, the SI was validated through 2 further studies. Factor analyses revealed a 24-item scale with three 8-item subscales, measuring the splitting of self, family, and others' images. The SI and its subscales were demonstrated to be internally consistent and stable over a 4-week period. Convergent validity was supported by significant correlations with measures of borderline and narcissistic personality disorders, self-image stability, self-esteem, depression, and negative affectivity. Discriminant validity was demonstrated by near-zero correlations with two measures of cognitive complexity. Contrary to predictions, the SI was significantly correlated with the Dogmatism Scale (Rokeach, 1960), a third measure of cognitive complexity. Research and clinical applications of the SI are discussed.
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