Final answer:
The Caspi study examined the influence of life stress on depression and identified individuals more susceptible to depression after stressful life events.
Step-by-step explanation:
The main point of the Caspi study from New Zealand was to examine the influence of life stress on depression and identify individuals who were more susceptible to depression after experiencing stressful life events.
The study found that individuals with a certain polymorphism in the 5-HTT gene were more likely to develop depression following stressful life events.
This study provides support for an integrative model of understanding depression, which suggests that both genetic and environmental factors contribute to the development of the disorder.