During the therapy, the patient was trained with some German words. In the test, both the treated and untreated words were tested. The results showed that only the performance of untreated homophones showed an improvement and no other untreated words did. The author conclude that the results supported the one phonological representation for both homophones and hence the shared representation hypothesis (Biedermann, Blanken & Nickels, 2002).
Interestingly, the different homophone effects were resulted from different types of tasks and different languages that were studied in research.