title: Experimental modification of caretaker-maintained high-rate operant crying in a 6- and a 20-week-old infant (Infans tyrannotearus): extinction of crying with reinforcement of eye contact and smiling.
mesh_terms: D002652:Child Behavior; D003216:Conditioning, Operant; D005108:Extinction, Psychological; D005149:Facial Expression; D006801:Humans; D007223:Infant; D008297:Male; D012054:Reinforcement, Psychology