Volitional control of breathing sends signals from the motor cortex that can influence emotional state.

“Now another thing that could affect um breathing how breathing practice can affect your emotional state is simply the descending command because breathing practice involves valitionial control of your breathing and therefore there's a signal it's originating somewhere in your motor cortex that is not of course that's going to go down to pre-buttzinger but it's also going to send off collaterals to other places those collaterals could obviously influence your emot emotional state.”