Alexithymia is a reduced ability to identify and express ones feelings. This may contribute to various physical and behavioral disorders. It may be measured using the Toronto Alexithymia Score. There is evidence from functional imaging studies that alexithymics process facial expressions differently from normals, leading to the suggestion that this contributes to disordered affect regulation.
Kano M, Fukudo S, Gyoba J et al. Specific brain processing of facial expressions in people with alexithymia: an H2 2003; 126: 1474-1484