Effects of text structure on the impact of heard news

In two experiments, audio re-recordings of texts transcribed from television newscasts were presented to independent groups, one group in each case hearing a ‘bulletin’ with original text structures (as broadcast), the other with key stories revised in accord with story-grammar notions and restoring chronological sequence in the narrative. In Experiment 1 the middle item in a three-story bulletin was subjected to text structure manipulation. After hearing the bulletin, subjects were questioned on information in the texts. In Experiment 2, subjects heard two stories with original or restructured text. In addition to being tested for retention they also rated for bias and quality of writing. Text restructuring improved learning in both studies, especially of information central to the main points of stories. In Experiment 2, such text revision also affected judgements of bias without altering assessment of writing quality. It is suggested that attention to assuring more coherent story structures in newscast texts could counter the problems of poor comprehension and perceived bias on the part of audiences which result from current production priorities and practices.     

The last word on induction?

Recent arguments of Watkins, one purporting to show the impossibility of probabilistic induction, and the other to be a solution of the practical problem of induction, are examined and two are shown to generate inconsistencies in his system. The paper ends with some reflections on the Bayesian theory of inductive inference.     

Multiple effects of visual format on TV news learning

Two experiments were conducted on edited TV newscast sequences to clarify effects of film accompaniment on learning from heard news text. In Experiment 1,150 British subjects viewed a sequence with either film format throughout or alternating film and ‘talking head’ format between items. Those items that were presented by ‘talking heads’ in the mixed sequence were learned better with film format, in which the heard text was accompanied by appropriate moving pictures. However, no effect of uniform context was found on the remaining items. In Experiment 2, 91 German subjects viewed one of four versions of a bulletin, one with ‘talking head’, one with film throughout, the other two having complementary mixed-format patterns. Besides confirming a beneficial effect of film presentation over ‘talking head’ which accords with the findings of all studies of learning from material in the form of national network newscasts, the results showed an impairing effect of uniform visual format. This can explain ‘contradictory’ findings, notably with atypical test material.     

The paired associate learning task: Is it an externally valid instrument for assessing methylphenidate response in children with attention deficit disorder?

The Paired Associate Learning Task (PAL-T) is a laboratory-based instrument commonly used for assessing psychostimulant response (and specifically cognitive nonresponse or toxicity) in children with Attention Deficit Disorder/Hyperactivity (ADDH). The present study examined the PAL-T's sensitivity in detecting overall and between-dose methylphenidate (MPH) effects, its operating characteristics, and its relationship with academic performance in 36 children with ADDH who underwent a placebo controlled trial of MPH at four dose levels. Children's PAL-T performance under active medication resembled but was uncorrelated with direct observations of their academic performance in the classroom. Negative predictive power (NPP) rates indicated that cognitive nonresponse to MPH did not portend a poor response in children's academic efficiency under identical dose conditions in the classroom. Clinical implications are discussed.The authors are grateful to the undergraduate and graduate student members of the Children's Learning Clinic who assisted with the conduct of this study.