OBSERVER BIAS By N., Pam M.S. - April 7, 2013 an experimental bias comprised of errors by a viewer in one direction. Such a bias is frequently correlated with the viewer's assumptions, beliefs, or private inclinations. OBSERVER BIAS: "Observer bias is less likely to occur in double-blind studies." Related Psychology Terms PHANTASM EXPERIMENTER EFFECT PARADOXICAL THINKING OBJECTIVITY VESTIBULAR NYSTAGMUS OBSERVER UNBIASED OPERATIONAL SEX RATIO URBAN LEGEND ASSUMPTION Cite this page: N., Pam M.S., "OBSERVER BIAS," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/observer-bias/ (accessed August 3, 2019).