 ASD and callous-unemotional traits \[[@pone.0000000.ref000], [@pone.0000000.ref000], [@pone.0000000.ref000]\]. It is thus plausible that although both ASD and callous-unemotional traits are negatively associated with general measures of empathic and pro-social behaviours, these associations may be driven by different underlying aetiological and socio-affective vulnerabilities.  