I imagine this would be mapped from the brains of "like" individuals- not necessarily of the same sex, race, etc, but usually from one geographic area. The problem with is that maybe this is not how all brains "map" learned things, but maybe a result of western thinking/education. Perhaps native Americans, who might view trees as just as close to humans as pigs are, might have quite a different "mapping." It would be interesting to see if this was a result of how our education system is (Western species/classification) geared rather than how our brains actually group things (as in, perhaps it is a manifestation of our education system rather than inherent organizational heuristics in the brain).