Background: Identifying and evaluating voice disorders is an introduction to the onset of treatment. Perceptual evaluation is based on the GRBAS scale, which reports each person's voice quality. This study aims to investigate whether spoken language and speech tasks may affect the GRBAS scale's perceptual evaluation results.

Methods: This study used 50 voice samples with disorders in Persian and Japanese. The tasks of the samples included prolonging 6 vowels, counting, and reading the text. These samples were evaluated by 15 evaluators with over 5 years of clinical experience in voice disorders. In each voice sample group, 5 samples were repeated.

Results: The results show that the highest and lowest percent of the correct response rate of perceptual evaluation were, respectively, Grade (51.6%) and Roughness (31.66%), and in Persian samples, Grade (70.93%) and Asthenia (47.46%). The low intra-rater reliability measures in the Japanese sample with high inter-rater reliabilities showed that Language plays an essential role in the accuracy of the perceptual evaluation. Text reading proved to be a more valid speech task for this type of evaluation.

Conclusion: Perceptual evaluations, such as the GRBAS scale, play a significant role in determining the severity of the disorder. Cultural and linguistic factors influence the results of this perceptual scale and scoring.

Keywords: Audio-Perceptual Assessment, GRBAS, Language.