Selections from a large longitudinal data set of verbal interactions between a mother and her child are presented. Two sets of three-term contingency sequences that seemed to reflect maternal rewards and corrections were noted. Both the antecedents as well as the immediate consequences of maternal interventions are presented to explore training and learning processes. The observed frequencies of three-step sequences are compared to those expected based upon Markov-chain logic to substantiate the patterning of the interactions. Behavioral conceptualizations of the learning process are supported by these analyses, although their sufficiency is questioned. It is suggested that maternal rewards and corrections should be integrated with perceptual, cognitive, and social learning conceptualizations in a skill-learning approach to explain the complexity of language transmission and acquisition processes.

To evaluate Brown's assertion that frequency of input is not a significant variable in language acquisition, some of Brown's data were reanalysed. The data pertaining to Adam, Eve, Sarah and their parents were predominantly obtained from Brown's (1973) book and were supplemented from the transcripts. Parental input frequency and the children's age at mastery were highly related for each of the three triads. Then Sarah's input and rate of language acquisition were compared with that of the other two children. The correlation between Sarah's relative input deprivation and her relative linguistic delay was 0·66. Finally, an analysis of Eve's acquisition of specific prepositional phrases involving the preposition in were made. Again it was found that frequency of input was highly related to frequency of production. Detailed analyses of parent-child interactions provided evidence also for short-term effects of input frequency.

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