An experiment was performed to determine the loci at which sentence contexts facilitate PA learning. The task given to 208 fifth- and sixth-grade children was that of learning 14 pairs of high-frequency nouns by a one-trial, study-test method. The principal independent variables were: the locus of presentation of the verbal context (study trial vs. test trial vs. both); and, the type of context (conjunction phrase vs. simple declarative sentence). For an outside control group, verbal context was not provided on the study trial nor on the test trial. In comparison with the control group, facilitation was produced only by sentence contexts and only when such contexts were provided during the study trial. The magnitude of facilitation was greater when the sentences were presented on both the study and test trials than when presented during the study trial alone. A mediation hypothesis is offered to account for the results.
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