The prodromal syndrome in psychological disorders consists of all of the following except:

• A. Subtle changes in thinking and perception
• B. A sudden onset of severe psychotic symptoms
• C. Decreased motivation and interest in activities
• D. Social withdrawal and isolation

Answer: (B)

Verified step by step guidance

1. Understand the term 'prodromal syndrome' in psychological disorders: it refers to the early signs and symptoms that precede the full onset of a disorder, often subtle and gradual in nature.
2. Identify the typical characteristics of the prodromal phase, which usually include subtle changes in thinking and perception, decreased motivation and interest in activities, and social withdrawal and isolation.
3. Recognize that the prodromal phase is marked by gradual and mild symptoms rather than sudden or severe ones.
4. Compare each option to the typical prodromal symptoms: subtle changes, decreased motivation, and social withdrawal fit the prodromal profile, while a sudden onset of severe psychotic symptoms does not.
5. Conclude that the exception in the list is the sudden onset of severe psychotic symptoms, as this indicates the acute phase rather than the prodromal phase.