"The ultimate triumph of the idea of individualism is that it's not really seen as an idea at all. It has seeped into our mental groundwater. ... But a burgeoning field has shown that, from the very first days of life, relationships shape our experience, our character, even our biology. This research, which has flowered in the last ten years, took root in the 1970s. One reason, explains the psychologist and philosopher Alison Gopnik, was the advent of the simple video camera. It allowed researchers to easily capture and analyze the exchanges between babies and their caregivers."