The psycholexical approach to individual differences

Abstract

Psycholexical study, rooted in encoding individual differences in natural language, comprises two stages: qualitative and quantitative. In the qualitative stage, experts collaboratively create a comprehensive list of descriptors from the language lexicon. This involves careful selection, operationalization, and reduction for subsequent quantitative studies. The quantitative stage employs principal component analysis to identify similarities in word usage, excluding the respondent from an expert role. Lexical research allows an exploration of how words describe predefined constructs, leading to hierarchical representations of individual differences. Crucially, this method goes beyond personality psychology, emphasizing its role in uncovering structures of all individual differences. Lexical research begins with a full set of descriptors, minimizing omissions. It offers stability, independent of the researcher, and facilitates comparisons with other studies at different levels of generality. This method aligns with a functional approach, recognizing cultural-specific and universal differences, making it valuable for both theoretical model development and confirmation. The aim of this article is to highlight the role of lexical assumption in the taxonomy of all individual differences (not only personality traits) and to systematize the most important information about psycholexical study.