Yang et al (2005, this issue) report what is probably the first structural neuroimaging study of lying. Adults were recruited from temporary employment agencies in Los Angeles. This will have been a complex and demanding study to perform; it has already yielded significant insights into the neural correlates of antisocial personalities drawn from that environment, indicating reduced prefrontal grey matter and diminished autonomic responsiveness (Raine et al, 2000). The current findings derive from a re-analysis of these data, themselves obtained from reliable blinded measurement of prefrontal white matter by magnetic resonance imaging. The groups were imperfectly matched on some variables (e.g. age), nevertheless, this did not detract significantly from the authors' findings: namely, greater prefrontal white matter volume among those identified as ‘liars' (relative to ‘antisocial’ and ‘normal’ controls).