ABSTRACT
This chapter presents case studies of four participants with chronic aphasia, aged between 52 and 62 years, who received treatment based on errorless learning procedures and operant conditioning for 7 months. Treatment effects were evaluated with a multiple-baseline design across behaviours. The performances that were treated varied across participants but were two or three of the following in each case: naming people or objects, making sentences, sequencing stimuli, discriminating written words, and unassisted recall. Treatment variables were clearly defined and systematically used in standard ways across participants with flexibility for adaptation to individual outcomes using clearly defined criteria. Prompts that were used in training faded out as performances improved. The performances of all participants improved significantly in all tasks; they all reached 100% correct performance without any prompts from the experimenter in at least one task. Generalization measures across stimuli and settings demonstrated that their improved performances generalized to novel stimuli and novel settings.
