In the 1980s, paranoid personality disorder received little attention, and when it did receive it, the focus was on its potential relationship to paranoid schizophrenia . The most significant contribution of this decade comes from Theodore Millon who divided the features of paranoid personality disorder to four categories: 1) behavioral characteristics of vigilance, abrasive irritability and counterattack, 2) complaints indicating oversensitivity, social isolation and mistrust, 3) the dynamics of denying personal insecurities, attributing these to others and self-inflation through grandiose fantasies and 4) coping style of detesting dependence and hostile distancing of oneself from others. 
Maternal stress has been associated with an increase risk of schizophrenia, possibly in association with reelin . Maternal Stress has been observed to lead to hypermethylation and therefore under-expression of reelin, which in animal models leads to reduction in GABAergic neurons, a common finding in schizophrenia.  Maternal nutritional deficiencies, such as those observed during a famine, as well as maternal obesity have also been identified as possible risk factors for schizophrenia. Both maternal stress and infection have been demonstrated to alter fetal neurodevelopment through pro-inflammatory proteins such as IL-8 and TNF .  
Stephanie Pappas is a contributing writer for Live Science. She covers the world of human and animal behavior, as well as paleontology and other science topics. Stephanie has a Bachelor of Arts in psychology from the University of South Carolina and a graduate certificate in science communication from the University of California, Santa Cruz. She has ducked under a glacier in Switzerland and poked hot lava with a stick in Hawaii. Stephanie hails from East Tennessee, the global center for salamander diversity. Follow Stephanie on Google+ .