I typically answer this question via my profiling methods, as the methods appear to identify the nature of the source of the anomalous information quite accurately despite the complexities surrounding such a question.
For many years I have worked along side individuals skilled in clairvoyant and mediumistic anomalous communication and have found certain characteristics exclusive to each type.
Typically, clairvoyants rank high in regards to category type Yellow, while mediums typically rank high in regards to category type Black. Throughout formulating psychical profiles, I have obtained more reports from type Yellows suggesting communications with “reality,” the “universe” or “Nature” itself (as though Nature itself is a universal information system) then I have in regards to type Blacks.
In reports involving type Black experients of psychical phenomena, multiple or a single “entity” is typically reported. These entities vary in description from ancestors, recently deceased relatives, spirits of the deceased in general, or those describe as non-human (angels, messengers of the gods, etc.).
While such is not always the case, as there are no pure types (i.e. people tend to blend into two to three major types), those who score high in regards to type Yellow typically communicate with Nature, while those who score high in regards to type Black typically communicate with entities. This is of course a generalized answer.