These tests were designed to measure overall intelligence, whereas Hebb believed tests should be designed to measure more specific effects that surgery could have had on the patient.
Need testid loodi mõõtmaks üleüldist intelligentsust, kuid Hebb uskus, et testid tuleks koostada moel, mis võimaldab mõõta spetsiifilisemaid ajukirurgia mõjusid patsiendile.