Alexithymia does not explain facial expression recognition difficulties across the dark triad spectrum

The dark triad encompasses socially aversive personality traits-narcissism, psychopathy, and Machiavellianism-and has been shown to be associated with expression recognition difficulties. Alexithymia has been shown to be associated with the dark triad, and recent evidence has suggested that co-occurring alexithymia may explain facial expression recognition difficulties found in the autism spectrum. Here, I tested this alexithymia hypothesis for individuals on the dark triad spectrum. Using an individual difference approach, I assessed whether trait alexithymia was able to predict unique variance in facial expression discrimination ability and facial expression labelling ability above and beyond an individual's level of dark triad traits. Results showed that autistic traits, alexithymic traits, and dark triad traits all correlated with expression recognition ability. However, linear regression models showed that an individual's level of dark triad traits, their level of autistic traits, and a brief measure of general cognitive ability each predicted unique variance in facial expression discrimination and facial expression labelling ability, but an individual's level of alexithymic traits predicted no additional unique variance. Results suggest that dark triad and autistic traits each contribute to expression recognition ability in unique ways alongside general cognitive ability.