According to Roy Kessels, a researcher at Utrecht University in the Netherlands, the main reasons for the forgetfulness are advanced age, preconceived opinions, stress, and a lack of visual explanations.
Hollandi Utrechti ülikooli teadlase Roy Kesselsi sõnul on unustamise peapõhjusteks kõrge iga, eelarvamused, stress ja visuaalse selgitusmaterjali puudumine.