Which dopamine pathway is responsible for negative symptoms of schizophrenia?

A. Avoidant/restrictive food intake disorder (ARFID) is an eating disorder characterized by extreme food restriction, leading to nutritional deficiencies, weight loss, or dependence on supplements. Unlike anorexia, it is not driven by body image concerns but rather by sensory sensitivity, fear of choking, or lack of interest in eating.

B. Pica involves the persistent consumption of non-nutritive, non-food substances (e.g., chalk, paper, dirt) for at least one month. It is commonly associated with nutritional deficiencies (e.g., iron or zinc deficiency), pregnancy, and developmental disorders such as autism.

C. Rumination disorder is characterized by repeated regurgitation of food, which may be re-chewed, re-swallowed, or spit out. It is seen in infants, children, and individuals with intellectual disabilities and is not due to a gastrointestinal or medical condition.

D. Food picking disorder. There is no recognized disorder called "food picking disorder" in the DSM-5. While some individuals may display picky eating behaviors, this does not qualify as a clinical diagnosis unless it significantly impairs nutritional intake, as seen in ARFID.

A. Eccentric. Individuals with schizotypal personality disorder (STPD) exhibit odd or eccentric behaviors, speech, and thought patterns. They may dress unusually, speak in vague or metaphorical ways, or hold bizarre beliefs that are not delusional but are far outside societal norms.

B. Mood swings. Frequent mood swings are not a characteristic feature of schizotypal personality disorder. Instead, they are more commonly seen in borderline personality disorder (BPD) or bipolar disorder. While individuals with STPD may experience transient emotional disturbances, their symptoms are more related to social detachment and cognitive distortions than rapid mood fluctuations.

C. Social anxiety. People with STPD experience intense social anxiety, often due to paranoia and distrust of others rather than fear of judgment (as seen in social anxiety disorder). Their discomfort in social situations does not improve with familiarity, leading to persistent isolation.

D. Paranoid. Paranoia is a core symptom of schizotypal personality disorder. Individuals with STPD often have suspiciousness and odd beliefs, such as thinking others are plotting against them or misinterpreting benign events as having hidden meanings. This paranoid thinking contributes to their social withdrawal and difficulty forming close relationships.