Alexithymia and depression: distinct or overlapping constructs?

Previous research showing moderate to high correlations between the Toronto Alexithymia Scale (TAS) and Beck Depression Inventory (BDI) has generated controversy as to whether alexithymia and depression are distinct or overlapping constructs. The present study addressed this controversy using the statistical method of factor analysis. In a sample of undergraduate university students, a correlation matrix comprising items from both the TAS and BDI yielded a four-factor solution with virtually no overlap of the significant factor loadings for the items from each scale, and with the factors corresponding closely with their respective construct. These results were replicated and cross-validated with a sample of psychiatric outpatients. The findings support the view that alexithymia is a construct that is distinct and separate from depression.