Bowlby analysed the case history of 88 patients from his clinic in London who were classified as emotionally unstable. He split the children into two groups: 44 had been caught stealing, 44 had not been caught stealing (control group). He was interested in whether or not they had experienced maternal deprivation and whether or not they were ‘affectionless psychopaths’. Affectionless psychopaths: are individuals who lack affection, shame and responsibility for their actions. These characteristics could enable someone to become a thief.