The problem explored by this study is the nature of b-d confusion as it is exhibited by remedial and nonremedial readers at various elementary ages in the areas of letter identification, spelling, and reading. The purposes of Phase I of the study were to examine the progressive phase-out of b-d errors committed by samples of remedial and nonremedial readers and to explore certain factors that could be related to the problem. The object of Phase II was to describe subjects with extreme b-d reversal problems. Extreme b-d reversers were found to have been average or below on first-grade-readiness scores and significantly below grade-level placement in reading achievement. School marks were also generally low. As a whole, the extremes were predominantly right-handed and no sex bias was detected. When the extremes were compared to subjects above average in b-d responses, the extremes made significantly more errors on other letters, were able to read significantly fewer words, and required significantly more assistance in spelling. These groups significantly differed on position of b-d reversals in reading, but not in spelling, nor on the proportion of real words actually produced when reversals were made in reading. Reversal of b and d was not associated in the same population as b-p reversals.

The purpose of this study was to evaluate the effects of a training package consisting of response restriction and the reinforcement of self-evaluation on letter reversal errors. Participants were 3 typically developing boys between the age of 5 and 7. The results indicated that the training package was successful in correcting reversals in the absence of a model during training and on application tests. These improvements maintained during subsequent follow-up sessions and generalized across trainers. Fading was not always necessary in correcting reversals, but was effective in correcting reversals that persisted during the overlay training procedures. The advantages to implementing a systematic intervention for reducing letter reversal errors in the classroom, as well as directions for future research, are discussed.