Brain signals may be monitored at different locations of a mood circuit in
order to determine a mood state of the patient. A relationship (e.g., a
ratio) between frequency band characteristics of the monitored brain
signals may be indicative of a particular mood state. In some examples,
therapy parameter values that define the therapy delivered to the patient
may be selected to maintain a target relationship (e.g., a target ratio)
between the frequency band characteristics of the brain signals monitored
within the mood circuit. In addition, in some examples, therapy delivery
to the patient may be controlled based on the frequency band
characteristics of brain signals sensed at different portions of the mood
circuit.