title: A confirmatory factor analytic investigation of the TAS-20: corroboration of a five-factor model and suggestions for improvement.
abstract: Alexithymia represents an individual difference dimension characterized by difficulties identifying emotions, difficulties describing emotions, and a utilitarian approach to thinking. The Toronto Alexithymia Scale-20 (TAS-20; Bagby, Parker, & Taylor, 1994) is a frequently used inventory to measure alexithymia, and although several studies have examined the factor structure of the TAS-20, a number of issues remain unresolved. Specifically, the severely unbalanced item-keyed nature of the TAS-20 has been suggested to limit the interpretation of the substantive Externally Oriented Thinking (EOT) factor. Further, it has also been suggested that the EOT factor may be better represented by 2 oblique factors. A review of the TAS-20 confirmatory factory analysis (CFA) literature has suggested that some improvement in CFA strategies could possibly be afforded by using a nested factors modeling approach. Based on a sample of 355 participants, we demonstrated that the TAS-20 was better represented by a nested factors model with 5 substantive factors. A novel, latent variable approach to estimating internal consistency reliability revealed that the subscales within the TAS-20 were associated with unacceptably low levels of reliability independently of the global alexithymia factor. Although there was some CFA evidence to suggest the plausibility of a negatively keyed factor, a thorough examination of the items in question offered an alternative interpretation. Further development of the TAS-20']s Externally Oriented Thinking subscale is encouraged.
authors.affiliation: School of Psychology, University of Western Australia, Australia. gilles.gignac@psy.uwa.edu.au
authors.forename: Gilles E
authors.initials: GE
authors.lastname: Gignac
authors.forename: Benjamin R
authors.initials: BR
authors.lastname: Palmer
authors.forename: Con
authors.initials: C
authors.lastname: Stough
mesh_terms: D000293:Adolescent; D000328:Adult; D000342:Affective Symptoms / Q000145:classification* / Q000175:diagnosis* / Q000523:psychology; D000368:Aged; D003937:Diagnosis, Differential; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010552:Personality Assessment / Q000706:statistics & numerical data*; D011594:Psychometrics / Q000295:instrumentation; D012016:Reference Values; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires