According to the monoamine theory of mood, what results from too little activity of monoamine neurotransmitters?

The monoamine theory of mood suggests that mood and emotional states are significantly influenced by the levels and activity of certain neurotransmitters, often referred to as monoamines, which include serotonin, norepinephrine, and dopamine. According to this theory, a deficiency in the activity of these neurotransmitters can lead to various mood disorders.

Specifically, reduced activity of these monoamines is primarily linked to depression and associated symptoms such as low energy, feelings of sadness, and a general lack of motivation. When these neurotransmitters are insufficiently active, the result is often a dysregulated mood, leading individuals to experience depressive symptoms. This understanding aligns with the clinical observations that lower levels of serotonin and norepinephrine are often found in individuals diagnosed with depression.

In contrast, the other options present states of mood and energy levels that are typically associated with increased, stable, or hyperactive mood states, which do not correspond with the implications of the monoamine theory regarding low activity of these neurotransmitters.