Any kind of, there is no standard/or "police" to enforce. Generally manufacturer can pick any kind of transition to refer to, and you bet they mostly pick the best ones - exploiting the fact that people hardly have proper understanding of such complex subject and mostly just think "lower number is better".
E.g. Acer Z35 listed as "response time 4ms G2G" while on certain transitions (e.g. from black) its over 50ms and looks horrible.
Your best bet to look for response graphs/tables, for examples ones that TFTcentral makes.