What is cluster A?
Cluster A is called the odd, eccentric cluster. It includes Paranoid Personality Disorder, Schizoid Personality Disorder, and Schizotypal Personality Disorders. The common features of the personality disorders in this cluster are social awkwardness and social withdrawal. What is Cluster A and cluster B? Cluster A disorders are defined by “odd” thinking and behaviors like paranoia or a lack of emotional responses. Cluster C disorders are defined by anxious thoughts and behavior.