Differential susceptibility to the environment can be understood from various perspectives, including evolutionary and neurobiological ones (Ellis & Boyce, 2011). At the evolutionary level, there are advantages to having two types of people in the population. The first type of person is highly sensitive to the social environment and settles quickly in the native environment. The backdrop is that these people also have a greater tendency to feel lonely. The other type of person is less sensitive to any type of social environment and sets out to explore the world. The advantage for these people is that they are less inclined to feel lonely (Belsky & Pluess, 2009). At the neurobiological level, people who are more susceptible to the environment have acquired an optimal level of stress reactivity, which primes them to thrive socially under supportive conditions and causes them to suffer from loneliness in unsupportive conditions (Boyce & Ellis, 2005).