Examined developmental changes in the use of distance-based and calendar-based approaches to estimate the recency of two events. Found that children's ability to discriminate temporal relationships between two events appears by four to five years of age. In contrast, use of calendar information and cognizance of annual patterns was found only in…

A study of the speech process was conducted. The process is described as one closely linked to the one involved in the problem of the serial order in behavior. It is pointed out that in the speech of young children the grammatical relations that are properties of elementary underlying sentences appear in the grammatical meanings. Six examples of…