Final answer:
Low serotonin levels may predict neuroticism, a trait associated with negative emotions, which can be confirmed with the NEO-PI-3 psychological personality inventory.
Step-by-step explanation:
Doctors finding low levels of serotonin in a patient may predict neuroticism, which can be assessed using the NEO-PI-3. Low serotonin levels are often linked to depression, a mood disorder characterized by feelings of sadness, loss, anger, or frustration that interfere with daily life. Neuroticism is a personality trait associated with negative emotions like anxiety and unhappiness.
Neuroticism is part of the five-factor model of personality, which also includes extraversion, agreeableness, conscientiousness, and openness to experience. Individuals high in neuroticism tend to experience emotional instability and other negative emotions. The NEO Personality Inventory (NEO-PI-3) is a psychological personality inventory that can confirm a high level of neuroticism and is widely used in research and clinical settings.