Through which medium does kammic information travel after the break-up of the body? If we understand kamma-vipaka as the process of creation and perpetuation of habitual volitional deeds, we can see that, in a living being, there's a medium through which behavioral information is stored and expressed: the nervous-system and its constituents. Information is stored through the reinforcement of synaptical conections. If we agree on that, it seems that there's no need for additional explanations for the arising and ceasing of behaviors.

How does this happens after the break-up of the body? How is information transferred from the last moment before death to the newborn? Does that information waits until the formation of the brain? Is it stored in the DNA? 

Do the buddhist texts offer any clue to understand this process? Do you know something that could help me to understand this process? 

I know DNA and the role of the nervous system are recently known and understood (at least in part) phenomena. I'd be happy to learn about any hypothesis or tentative explanation for this process. 

I don't know if this question is a valid one for this site. If it's not, feel free to close it; I'd understand. 

Thanks for your time and patience!

Kind regards!
Questions of King Milinda say, "it is nama-rupa that is reborn". When the King asks whether it is the same nama-rupa, Nagasena says, it is not the same, but this nama-rupa arises in causal continuity with the previous nama-rupa, and thus we talk about "rebirth".

Questions of King Milinda also compare rebirth to a memorized verse passing from one person to another, and to a flame passing from one lamp to another. It is clear that rebirth is about causal continuity and the passage of (some) information.

Japanese Zen patriarch Dogen explained that the underlying nature of mind is not separate from the underlying nature of the rest of material world. In numerous explanation in Zen and Vajrayana there is a rather clear consensus that the nature of mind are dynamically interacting relationships, both inside the person, and between the parts of the world.

So when we are talking about rebirth we are talking about continuity of interacting relationships implicitly "stored" or "encoded" in the fabric of activities happening in the world at large.

So the media that carries the karma after the break-up of the body is the world itself. People, things, activities, relationships carry the imprints of the previous existence into the next.

At least, this is my understanding.