Doctorsâ unconscious biases favor whites but do not affect high blood pressure treatment for their minority patients, according to a University of Colorado Boulder study, even though a previous study by the same research group found that doctorsâ biases are reflected in lower ratings by African-American patients. The new research, led by Irene Blair, an associate professor in CU-Boulderâs Department of Psychology and Neuroscience, is published in the Journal of General Internal Medicine.