C) Hypersensitivity often creates a cycle of self-fulfilling prophecies. A child who grew up in foster care being shuffled around to different homes will likely develop an insecure attachment and hypersensitivity towards abandonment. This is likely to make them clingy, obsessive, and paranoid, all of which may cause the very abandonment they fear in their relationships as adults. A child who was frequently put down or ridiculed growing up will develop hypersensitivity towards disapproval. This may cause them to "read" rebuke in others where none was intended, to feel hurt over teasing that was meant all in good fun, or to otherwise get upset in areas of social interaction that wouldn't trouble their less-sensitive peers. When this happens, they often withdraw from others, creating for themselves a loss of social connection and feelings of rejection, leading to a self-fulfilling prophecy.
Through this sculpting of the brain it's actually possible to do physical brain damage to a child in severely negative environments. (add ref) Cortisol, the stress chemical, shuts down functioning in the higher reasoning areas to create an impulsive reaction to the event. But in constant, high and ongoing levels, it wreaks havoc on the brain. When a child is subjected to severe chronic stress, the excess cortisol on the brain actually kills off existing brain cells and inhibits the growth of new ones, creating a very real and very physical brain damage, in some cases no different than what might be caused by a stroke. This lasting brain damage means that children who come from chronic stress environments generally exhibit lower IQ's and impaired cognitive functioning.