1. A computer-implemented method of measuring eye data of a subject during emotional testing, the method comprising: determining a test stimulus to present to a subject; presenting to the subject, on a display device, a conditioning stimulus, wherein pixels of the test stimulus are scrambled to create the conditioning stimulus; presenting to the subject, on the display device, the test stimulus; collecting eye data from the subject while the subject is viewing the test stimulus; and processing the collected eye data to determine the subject's emotional response to the test stimulus.