Effects of arithmetic problem difficulty on pupillary dilation in normals and educable retardates.
D000704:Analysis of Variance; D001143:Arousal; D001288:Attention; D002648:Child; D004106:Dilatation; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D008607:Intellectual Disability; D008297:Male; D008433:Mathematics; D011340:Problem Solving; D011680:Pupil