In this case, the children watched a video of a dolphin swimming in the ocean so that the researchers could collect their baseline stress response. Next, they watched a second, more stressful, film involving a lamp causing a fire in a girl  room, which elicited their normal autonomic arousal patterns under stress.

The results show that the combination of high SCR and high family risk predicted substantial increases in personality change and behavior problems. The researchers observed the children four separate times over the course of six years, making this the first study to show that the interaction of family adversity with a biological characteristic is associated with longitudinally measured change in childhood personality.