In a groundbreaking study, Dr. Lisa Cooper, a leading researcher on racial health disparities at Johns Hopkins University, found that nearly all 40 participating Baltimore-area primary care doctors said they regarded their white and their Black patients the same. But that’s not what her testing on their unconscious attitudes revealed. Those tests, conducted a decade ago, showed that two-thirds of the physicians preferred white patients over Black. About the same percentage perceived white patients as more cooperative, while they perceived Black patients as more mistrustful and reluctant to com…