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.
Menurut Roy Kessels, peneliti di Utrecht University di Belanda, alasan utama kelupaan itu adalah usia lanjut, opini yang sudah dianut terlebih dahulu, stres, dan kurangnya penjelasan visual.