Depression is linked to ____ serotonin and aggressive behavior is linked to ____ serotonin.

• A. high; high
• B. low; high
• C. high; low
• D. low; low

Answer: (D)

Verified step by step guidance

1. Understand the role of serotonin in psychological functions: Serotonin is a neurotransmitter that influences mood, emotion regulation, and behavior.
2. Recall that depression is commonly associated with lower levels of serotonin, which can lead to symptoms such as sadness, low energy, and lack of motivation.
3. Recognize that aggressive behavior has also been linked to lower levels of serotonin, as reduced serotonin can impair impulse control and increase irritability.
4. Match the correct serotonin levels to each condition: depression corresponds to low serotonin, and aggressive behavior also corresponds to low serotonin.
5. Conclude that the correct answer is 'low; low' because both depression and aggressive behavior are linked to low serotonin levels.