Major depression is characterized by all of the following EXCEPTdisturbances of sleep patterns.suicidal thoughts.talkativeness.diminished pleasure.

To identify which characteristic does not belong to major depression, let's review each option:

1. Disturbances of sleep patterns: This is a common symptom of major depression. Individuals often experience insomnia or hypersomnia.

2. Suicidal thoughts: Suicidal ideation is a significant risk associated with major depression. It can manifest in various forms, including passive thoughts of death or active plans for suicide.

3. Talkativeness: Generally, individuals with major depression tend to exhibit decreased energy and may be less talkative, leading to a common symptom known as "psychomotor retardation." This characteristic does not align with major depression.

4. Diminished pleasure: This refers to anhedonia, which is a hallmark symptom of major depression, where individuals no longer find enjoyment in activities they once loved.

Conclusion

The correct answer is talkativeness, as it is not associated with major depression, while the other options are prevalent symptoms.