1. Introduction

This chapter introduces the topic of idiom comprehension and the difficulties that patients with aphasia (PWA) may have in understanding idioms. It discusses the lack of studies regarding Chinese PWAs' idiom comprehension and explores how familiarity and context influence idiom comprehension among healthy individuals. The chapter also outlines the objectives of the study and the design of the case study experiment.

Paper chapter: 2. Methodology

This chapter describes the methodology for the case study, including the task design and procedures. It also outlines the participants' characteristics and gives a detailed explanation of the experimental process. Additionally, it discusses the choice of stimuli and the data analysis methods used in the study.

2. Literature Review

This chapter discusses previous research on idiom comprehension, including different hypotheses and models proposed to elucidate the mechanism of idiom comprehension. In addition, it explores the unique characteristics of Chinese idioms and the distinct processing models and neural mechanisms for Chinese idioms. Moreover, it reviews the findings of studies examining idiom comprehension of patients with aphasia, revealing deficiencies in their ability to comprehend idioms and a tendency to interpret idioms literally, especially those with frontal and/or temporal lobe lesions. However, these patients retain the ability to categorize idioms as abstract concepts despite their difficulties in comprehension.

3. Methodology

This chapter outlines the methodology and procedures used in the study. It involved three right-handed Chinese participants with aphasia who were undergoing language rehabilitation. The study used a string-to-word matching task to examine the comprehension of idioms. The experiment included 96 items, consisting of 72 experimental items and 24 filler items, presented in two blocks. Each of the three participants was required to choose the most appropriate probe word from an array of options after reading each experimental item. The participants' linguistic competence was evaluated prior to the study. Pretests were conducted to select the idioms used in the experiment. The top 12 pairs of idioms were chosen as the experimental materials based on the results of the pretests.

4. Results

Chapter 4. Results

The participants with aphasia showed a clear tendency towards literal interpretations when literal cues were provided, resulting in lower accuracy rates. When literal cues were removed, they exhibited a significant improvement in accuracy rate, suggesting a struggle to resist their inclination towards literal cues.

The presence of a literal cue led to a strong inclination towards literal interpretations among the participants, with minimal errors in abstract and concrete inclinations. When the literal cue was removed, a slight difference between abstract and concrete inclinations emerged. Error analysis of literal paraphrases indicated a strong reliance on abstract concepts when comprehending idioms.

The influence of familiarity on idioms was found to have less influence on the comprehension of idioms among participants with aphasia. The level of familiarity did not significantly affect the accuracy of responses. Additionally, the ability to recognize and match synonyms remained intact in participants.

Context had a limited contribution to the processing of idioms among participants with aphasia. While there was a slight increase in accuracy when context was provided, the difference was not significant, indicating that context contributes less to their overall comprehension of idioms. Participants appeared to struggle with understanding and recalling the context provided.

5. Discussion

This chapter discussed the deficiencies in Chinese idiom comprehension among patients with aphasia, emphasizing the differences in hemisphere involvement and lesion sites. It also explored the influence of familiarity and context on idiom comprehension, highlighting the unique characteristics of Chinese idioms. Additionally, it found that patients with aphasia retained the ability to classify idioms into abstract semantic categories. Furthermore, the influence of other factors such as age-related brain mechanisms, literalness of experimental idioms, gender disparities, and diverse educational backgrounds on idiom comprehension among patients with aphasia was examined.

6. Conclusions

This chapter discusses the significant findings of the study on Chinese PWAs' comprehension of idioms. The study observed deficiencies in idiom comprehension, with individuals relying heavily on literal meanings. It was noted that the processing of Chinese idioms differs from alphabetic languages, involving both brain hemispheres. Familiarity has a weaker impact on idiom comprehension for individuals with left hemisphere damage, and those with bilateral lesions show insensitivity to both familiarity and context. When literal interpretations were eliminated, participants demonstrated the ability to classify idioms with abstract concepts into the same semantic category. These findings suggest the involvement of the temporal lobe and the right hemisphere in maintaining the ability to recognize idioms' semantic categories.