Final answer:
Social withdrawal and decreased interest in relationships is the personality characteristic commonly associated with both Psychasthenia and Schizophrenia.The correct equation is B)
Step-by-step explanation:
The personality and interpersonal characteristic commonly associated with both Psychasthenia and Schizophrenia is B) Social withdrawal and decreased interest in relationships. Psychasthenia, often associated with obsessive-compulsive features, includes behaviors that reflect social withdrawal and a decreased interest in interpersonal relationships, similar to those seen in schizophrenia. Schizophrenia is a mental disorder characterized by a breakdown in the relation between thought, emotion, and behavior, leading to faulty perception, inappropriate actions and feelings, withdrawal from reality and personal relationships into fantasy and delusion, and a sense of mental fragmentation. Symptoms such as social withdrawal, inability to experience pleasure, and a flattened emotional state are common in both conditions. This social withdrawal can be linked to the high levels of introversion that are associated with individuals who have a preference for being alone or with a select few rather than engaging with larger social groups, which is a characteristic mentioned in the theories of personality by Eysenck and Cattell.