The "significant conclusions" portion of that article is amusing, that information was known long before this study. Any second year medical student would be able to describe the effects of an RNC. I've posted those same facts in these "how does an RNC work" threads for a couple years now.
40% of the blood supply goes through either internal carotid, with the remaining 20% via the vertebral arteries. Cerebral hypoxia results from mechanical compression of the internal carotids, which leads to loss of consciousness. The "sensitive receptor located in the neck" or carotid baroreceptor is not a significant contributor to LOC in most individuals. However, there is still a very small subset of people out there who have very sensitive/reactive baroreceptors which can cause rapid LOC (via drop in BP) with relatively little pressure.
Originally Posted by buhriyon
This is great now I can stubbornly refuse to tap to chokes and not worry about brain damage.
That's not true. You can have a carotid dissection that can lead to permanent neurologic deficits - actually have a friend who had this happen to him during practice, although he was extremely fortunate and got treatment fast and had no permanent effects.