FIGURE 13.14 Cold-blooded arousability and risk of crime Levels of the stress hormone adrenaline were measured in two groups of 13-year-old Swedish boys. In both stressful and nonstressful situations, those who would later be convicted of a crime (as 18- to 26-year-olds) showed relatively low arousal as 13-year-olds. (From Magnusson, 1990.)