its probably much more complex than that.
I'm sure it is

Let's look at when brain zaps happen though: most often after SSRI discontinuation, MDMA use or abuse that was in some way inappropriately (or in susceptible individuals) and sometimes with drugs like mushrooms apparently. I would believe other suggestions of serotonergic drugs.
As for caffeine and the supposed involvement of adenosine and it's receptors in the dopaminergic system: it is an example of how these systems and 'circuits' are interconnected. Activation of one system is likely to activate or inhibit another one. Rather than dopamine:serotonin levels (where exactly, perhaps synaptic levels?) I would personally think of dopaminergic pathways affecting the serotonin system significantly and even through caffeine's adenosine effects through dopamine to serotonin. It seems to me that though I have not been specific about anything and basically don't really know the specifics enough to understand well what I am talking about, this is the chain of 'causality'. Why? Because I have not yet heard of brain zaps after drugs like anti-psychotic dopamine antagonists or DARI's and certainly not caffeine alone because IIRC it's effects are at some point attenuated or at least there is significant tolerance effect which is why some people can drink pots every day.
So, either directly or indirectly all I have heard is associations with the serotonergic system. Now what exactly is going on, if there is too much or too little and where and how, that I can't even begin to try and explain.
edit: It seems I had forgotten about GABAergic withdrawal also being able to cause this, but again: directly or indirectly? Is there an excess of glutamate that cascades through secondary pathways?
It seems to happen the most with SSRI discontinuation which is known to chronically change the super-pattern of serotonergic activity so to speak. Something about it's signalling transmission is altered, which may differ locally or happens in a very specific uniform way. So I imagine this activity to be orchestrated in a specific 'rearrangement' and when this stops the brain must return to doing this the natural way again and snap back into place. Depletion by MDMA for example would also temporarily force the brain to manage it's neurotransmission differently before snapping back. This 'snapping' seems to cause the zap.
Again: I HAVE to say, I am dreaming aloud on the subject and would love for some ADD-level wisdom to be bestowed but perhaps it cannot because nobody doesn't really understand yet and more research may have to be done. I wonder, is it possible to create in vitro zaps or is a larger piece of nervous system needed for the buildup of charge? I'd bet my money on the latter, analogous to putting a mile of duracell batteries in one connective chain and shocking the shit out of something if it short-circuits through it.
Please, keep the sharing of outspoken dreams coming, though facts are of course a hundred times better. I'll give you a virtual hug for some of those.

http://www.pointofreturn.com/brain_zaps.html
The small amount Serotonin in the CNS attaches to receptors that lie along the brain stem from the midbrain to the medulla (lower half of the brainstem). Most antidepressant medications work by holding serotonin for longer periods in the synaptic spaces of the nervous system, and it is this space between nerve cells that has an electrical current. Since Serotonin transmits currents, it is highly possible that holding the Serotonin longer than nature intended could cause a misfiring of electrical current resulting in a Brain Zap. communicate in multiple ways.
The logic doesn't seem to hold because brain zaps don't tend to happen - shit I gtg
Benzodiazepines and Sleeping pills work on GABA (Gamma-Aminobutric Acid), which is the neurotransmitter that prevents over-stimulation of the central nervous system. Continual use of anxiety medications and sleeping pills 'down regulate' the GABA receptors and reduce their ability to ease an over-excited state. This could explain the Brain Zaps that occur while on medications or in the withdrawal process for drugs that affect GABA. Rather than inhibiting the electrical activity in the brain, tolerance and withdrawal symptoms over-stimulate, allowing more electrical impulses to go unchecked.
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