Two studies investigated the presence of precursors of symbol formation in eight autistic children (nine years old) compared to matched retarded children. Results indicated that autistic Ss could form internal images but appeared to be unable to manipulate them in a purposeful and meaningful manner. (Author/CL)

There were 120 pupils in years 1 to 5 from two schools which were interviewed using specially prepared tasks to study the variety of interpretations given to letters by adolescents. Results indicate that two distinct conceptual understandings of the role played by a letter in relation to geometrical data exist in pupil's thinking. (Author/TG)

Examines the influence of gender, reading level of student, and source of data on science concept formation and retention. Results indicate that reading level of students does influence science concept formation and retention, but gender and source of data (method of instruction) do not. (MA)

To assess the importance of visual attributes relative to acoustic and semantic attributes in children's encoding, a 64-item recognition test was administered to first- and sixth-grade children. Recognition items were linedrawings of simple objects accompanied by aural labels. By manipulating the picture, label, and referent in various…