The difficulty is the there is the possibility, that binding affinities are themselves variable from person to person.
The reason I think this is likely, is because of EEG research showing alpha, beta, gamma, delta, and theta brainwaves having distinct forms, that scientists postulate specific states of mind relating to, based on only small samples, and then further postulate that their small sample can be generalized by relating those states of mind, with the behaviour of the body at the time, and without taking any account for the cultural conditioning of the body's behaviour.
For example, the beta brainwaves, are strongly associated with an awake and alert state of mind, by researchers in North America. Yet perhaps Asian researchers, or even Australian, if replicating the same exact work, might be more likely to find that beta brainwaves are stronger during rest and sleep. Another example, is the example which gave me a clue that this direction of thinking could be fruitful. Delta brainwaves are cited as occurring in deep sleep among North American research subjects. Yet simultaneously, how the delta mindstate is described, fits the patterns described among the Curandero of Mestizo culture of the Amazon, as water spirit conscious. Thus any person who is aware of the water spirits while awake, may have delta brain activity during normal waking state of mind. A fact I am acutely aware of given that local indigenous Shamanic experience of Australia, is totally water spirit oriented, and is that I am initiated into.
Now, of course you will have the scientific mindedness to come back and say, that the binding affinities do not necessarily have a relationship with the alpha, beta, gamma, delta, and theta recordings of measurable brain waves, relating with distinctly uniquely described mind states. However the point I am extrapolating from the EEG research into brain wave frequencies and relationship with distinct states of mind, is that our cultural biases, defined by upbringing and acculturation, interact with the patterns in our brainwaves.
Now if we think of the processes called "ego death", we need realise that the formation of our ego is culturally defined. For example, if there was a Steamboat Willie cartoon getting in the way of attuning with all of Mother Nature, we need think of that fact as culturally ascribed. Thus when we examine the total effect of any psychedelic, we need think of each process in each person, as having a uniqueness. A uniqueness nevertheless in part defined by upbringing and acculturation, therefore ethnicity will be the most likely set of groupings that each generalised pattern falls into. Therefore, my advice in undertaking any such research, is that the subjects of research need be inclusive of as many different ethnic groups as possible, (and understand that a fundamental flaw exists in research not inclusive of every ethnicity). I think the work being done by Kalindi li, and his team, might be corroborative of my thinking.
a mother a daughter a lover of life, an exorcist of addictions if ere in need of the strife, and at bottom line a wife, I might well be a bore, yet have no doubt, I stand among the poor, and beg not what for, that hat hath at, nobody's mind fell too flat