title: Reversal and extradimensional shifts in two socioeconomic groups of preschool children.
mesh_terms: D002675:Child, Preschool; D003118:Color Perception; D004193:Discrimination Learning; D005260:Female; D005556:Form Perception; D006801:Humans; D008297:Male; D012193:Reversal Learning; D012923:Social Class; D012959:Socioeconomic Factors; D013997:Time Factors