- 44 child thieves and a control group of 44 emotionally disturbed non-thieves were interviewed to assess affectionless psychopathy, parents asked about maternal deprivation during critical period
- found that 14 thieves matched the criteria for affectionless psychopathy compared to none in the control group, 12 experienced prolonged separation compared to 2 in the control group
- suggests a link between maternal deprivation and delinquency