Are there any known neural correlates of the function of the cardiovascular system? I'm looking for research results that use standard brain imaging techniques (e.g. electroencephalography, magnetoencephalography, or functional magnetic resonance imaging), and compare the brain signals to respiratory and/or electrocardiographic signals.
Actually, ECG is frequently seen in EEG and MEG recordings. It is considered as an artefact, and typically removed in an early phase. Only the QRS complex is usually visible (or the R wave). If the ECG was recorded from the chest/limbs, proper signals would be gained. It would be interesting to compare the heart rate variability etc. to brain signals but has this for example been already done?
I don't have much background to respiratory signals, so I'm particularly interested about that.