When No Speech Norms Exist: Observations From Sinhala.

Area of Science:

• Speech-language pathology
• Linguistics
• Child development

Background:

• Accurate assessment of child speech sound difficulties requires language-specific phonological development norms.
• Currently, English norms are often used for Sinhala-speaking children, potentially leading to misdiagnosis.
• This study addresses the gap by documenting typical phonological processes in Sinhala.

Purpose of the Study:

• To document phonological processes in typically developing Sinhala-speaking children aged 3;0-6;11.
• To establish preliminary language-specific norms for Sinhala phonological development.
• To inform clinical assessment and intervention for speech sound disorders in Sinhala.

Main Methods:

• A preliminary exploratory study involving 102 Sinhala-speaking children from three geographical locations.
• Development and administration of the Test of Articulation and Phonology-Sinhala (TAP-S).
• Quantitative analysis (percent consonants/vowels/phonemes correct) and qualitative analysis of phonological processes.

Main Results:

• Age significantly influences phoneme production accuracy, with over 75% consonants correct by 3 years 6 months.
• Common phonological processes identified include fronting, stopping, and weak syllable deletion.
• Unique findings include the denasalization of prenasalized stops in Sinhala, not widely documented in speech pathology literature. Shared processes with Sri Lankan Tamil were also noted.

Conclusions:

• Language-specific phonological norms are crucial for accurate identification of speech difficulties in Sinhala-speaking children.
• The documented phonological processes provide a foundation for developing culturally and linguistically appropriate assessment tools.
• Early and accurate intervention for speech sound disorders can be improved by utilizing these language-specific findings.