title: Secondary reinforcement in infants.
mesh_terms: D002652:Child Behavior; D002657:Child Development; D003216:Conditioning, Operant; D004193:Discrimination Learning; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D009949:Orientation; D012054:Reinforcement, Psychology; D012201:Reward; D013016:Sound; D013028:Space Perception; D014796:Visual Perception