James William deg udlis-is i wumi yefka azwel  The principles of psychology yenna-d:  tasnimant n usgemzan (n tesngmit) d tarrayt tasensegmit, ilaq ad tili temtawa akked tesnimant, maca mačči d tagi kan i iwulmen . Aṭas n inegrawen yemgaraden zemren ula d nutni ad qaddren isuḍaf n tesnimant.19