Perceptual learning in human and nonhuman animals: A search for common ground

Perceptual learning has been extensively studied in both human and nonhuman animals, but the two lines of research have, for the most part, developed independently, addressing seemingly rather different issues by rather different methods. It has been argued, however, that analysis of the disparate phenomena studied in experiments on perceptual learning reveals that in all the studies, the essential feature is that appropriate training allows behavior to come to be controlled by the unique features, rather than by the common features, of similar stimuli. It has further been argued that experiments with nonhuman animals have established the existence of a range of learning processes that allow this to occur, and that these processes have general relevance, applying to humans as well as to animals.     

The influence of pictures on the derivation of meaning from children's reading materials

This discussion is a review of experimental work designed to determine whether pictures have an effect upon the derivation of meaning from the text printed in children's reading materials. Many reading schemes emphasize the use of illustration, but for a number of different purposes ranging from the provision of a referent for a specific word, to the provision of' contextual support, and the generation of motivation for reading. Experimental studies of the interactions between pictures arid words in the cognitive system go some way to supporting three uses of illustration in (a) the provision of meanings against which the print may be compared, (b) in the development of an organized understanding of the meaning of the text, and (c) in the enhancement of subsequent recall. The danger of distraction arising from the pictures has also been investigated, and been found to lead to decoding errors in young children presented with one word at a time. An analysis of mutual interference effects between pairs of pictures and words leads to the conclusion that the cognitive representations of meanings arc organized in a semantic system common to pictures and words. Thus, any decoding errors due to interference effects are of more than local importance—they can affect comprehension and influence the stored representation.     

THE EFFECTIVENESS OF COLOUR IN LEARNING FROM EDUCATIONAL TELEVISION

The author reviews recent research comparing both the relative learning gains and relative attitudes of students using colour or monochrome television material. It is concluded that all users of educational television should resist the temptation to spend large sums on colour television equipment merely because colour is now widely preferred by society at large.     

Response strategies after overtraining in the jumping stand

Rats were trained to criterion (CT) and overtrained (OT) on a horizontal against vertical stripes discrimination in the jumping stand. A change in response strategy, from inspecting both stimuli to inspecting just the S?, was observed during overtraining. Replacing the S? with a novel stimulus disrupted performance in the OT Ss, but replacing the S+ did not. Performance in the CT Ss was disrupted, but not very severely, both when the S+ was replaced and when the S? was replaced. These results suggest that OT Ss in the jumping stand come to rely especially upon the S?. The overtraining effects found here are compared with those found in other types of apparatus.