Another is that our observations are incorrectly focused, an instructors focus of attention is subject to the same limitations as the students. Moreover, instructors are subject to cognitive biases that incline them to seek confirmation of pre-determined concepts, particularly if they have made public pronouncements on a topic. The advantage of the material that is presented by people like Winkelman, Gray et al is that the cited evidence has been subjected to independent scrutiny, unlike the written word on the board.When something is written that doesn’t fit with our observations there are several possibilities, just accepting the written word however is not one of them.
Anyway, I'm going fishing and see if I can catch anything with a T-38.
Regards
Vince