title: Frequency discrimination by young infants.
abstract: The nonnutritive sucking of groups of 1-month-old infants was conjugately reinforced with either a 200-H or a 500-H pure tone. Following response acquisition and satiation, the sucking of the experimental groups was reinforced with a new pure tone (either 500 or 200 H) to a criterion of response decrement, after which sucking was reinforced with the original tone. Control groups were reinforced with a single tone (200 or 500 H) throughout the experiment. Frequency of nonnutritive sucking increased significantly in the experimental groups following a shift in frequency of the reinforcing tone but remained unchanged in the control groups, indicating discrimination between 200- and 500-H tones.
mesh_terms: D000161:Acoustic Stimulation; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D010897:Pitch Discrimination; D012054:Reinforcement, Psychology; D012527:Satiation; D012737:Sex Factors; D013391:Sucking Behavior; D013997:Time Factors