Background: Empathy plays a key role in social understanding, but its empirical measurement has proved difficult. The Empathy Quotient (EQ) is a self-report scale designed to do just that. This series of four studies examined the reliability and validity of the EQ and determined its factor structure.
Method: In Study 1, 53 people completed the EQ, Social Desirability Scale (SDS) and a non-verbal mental state inference test, the Eyes Task. In Study 2, a principal components analysis (PCA) was conducted on data from 110 healthy individuals and 62 people reporting depersonalisation (DPD). Approximately 1 year later, Study 3, involved the re-administration of the EQ (n = 24) along with the Interpersonal Reactivity Index (IRI; n = 28). In the last study, the EQ scores of those with DPD, a condition that includes a subjective lack of empathy, were examined in depth.
Results: An association was found between the Eyes task and EQ, and only three EQ items correlated with the SDS. PCA revealed three factors: (1) 'cognitive empathy'; (2) 'emotional reactivity', and (3) 'social skills'. Test-retest reliability was good and moderate associations were found between the EQ and IRI subscales, suggesting concurrent validity. People with DPD did not show a global empathy deficit, but reported less social competence.
Conclusions: The EQ is a valid, reliable scale and the different subscales may have clinical applications.