The medulla contains the cardiac, respiratory, vomiting and vasomotor centers and so deals with the autonomic (involuntary) functions of breathing, heart rate and blood pressure.
Manslaughter has minor psionic talents, notably limited telepathic powers enabling him to perceive the activity of the autonomic nervous systems of other people.
Salivary alpha amylase levels have been found to correlate with heightened autonomic nervous system activity levels, reacting in similar ways to the hormone norepinephrine.
Responses can be endocrine, autonomic or behavioral, and responses to spikes in blood sodium levels include the release of atrial natriuretic peptide and oxytocin.