When I asked my teacher how cuticitta consciousness moves from one 5 khanda to another paṭisandhi… he gave me a “duh” look and pointed to all of the sense doors where consciousness moves to each moment. It was “enlightening” to understand this. The heartbase is “dead” when we “see” just as we are also deaf, etc when we see too. However, most of the mind moments are happening in the heartbase. Unfortunately, most of our mind moments are spent in bhavaṅga.
Of course, you need to understand momentariness as well to understand this. This thread talks a little about it.
My book which compares computers to the abhidhamma (shameful plug) also talks about this point as one of the primary subjects for understanding the major theme of abhidhamma.