title: Ikonic imagery in the severely subnormal.
mesh_terms: D000293:Adolescent; D000328:Adult; D002657:Child Development; D003071:Cognition; D003118:Color Perception; D003210:Concept Formation; D004495:Education of Persons with Intellectual Disabilities; D005260:Female; D005556:Form Perception; D006801:Humans; D008607:Intellectual Disability; D008297:Male; D008568:Memory; D008875:Middle Aged; D012858:Size Perception; D013236:Stereognosis; D013647:Task Performance and Analysis; D014796:Visual Perception