Schizoid Personality Disorder is a pervasive pattern of asociality, and is what many people refer to when they colloquially describe someone as “antisocial” (in the sense of lacking interest in socializing with others). Before getting into factors in modern society that promote the schizoid personality type, here are a few things to understand about schizoid PD: Schizoid PD has been grouped with other “Cluster A” personality disorders.  Cluster A personality disorders are marked by “odd or eccentric behavior.” Other Cluster A disorders include Paranoid Personality Disorder & Schizotypal Personality Disorder Schizoid PD is theorized to be on the Schizophrenia spectrum, meaning that the genotype and phenotype of schizoid PD are “cousins” of schizophrenia and other psychotic disorders. Recent estimates suggest that 1% of the population meets criteria for schizoid personality disorder Identical twin studies show that there is a 30% concordance rate of schizoid PD between twins While there may be a significant genetic component of schizoid pd, many have speculated that aspects of modern life may be responsible for a growing number of cases …