Given that the heart is generator which drives electrovolt oscillations through the nervous system and the fat of the brain, and that the extracerebral field created by the electrovolt potentials in the tissues of the brain is nonlinearly related to the electrical activations through the axons and dendrites in the tissues of the brain,

Are there electrical cycles in the brain (and thus feedback and probably spiking) or does the charge distribute through the brain in a DAG directed acyclic graph?

Are there stable neural correlates to ear worm or rumination or flow states, for example?

Is sustained charge necessary for data persistence in the brain, as it is for RAM?

Paraphrasing the model's reply to force myself to learn:

The brain is observed to be cyclical with feedback cycles. (Biological neural networks thus cannot be sufficiently modeled with DAGs. RNN Recurrent Neural Networks do model cycles.)

The brain is actually its own generator.

The oscillations of the brain are measurable with e.g. EEG; and are distinct from the heart, which is measurable or imaged with ECG, for example.

Long term memory depends upon synaptic plasticity, which does not require continued electrical charge, though short term memory does depend upon neuronal oscillations which depend upon continued electrical charge.

The DMN Default Mode Network in the brain is observed to be less active in so-called flow states; and more active during daydreaming, ear worm, rumination, and self-reflection. The DMN is probably feed-forward too.