The Duke-Heidelburg quotient was, in the field of 23rd century psychology, a relative means determining the potential in one's abilities of possessing extrasensory perception; especially when used in correlation with the esper rating, aperception quotient, and general knowledge quotient. According to a readout on Dr. Elizabeth Dehner in 2265, she had a Duke-Heidelburg quotient rating of 256. Her ratings were considered "better than average."