A new protocol for assessing viseme perception in sentence context: the lipreading discrimination test

Area of Science:

• Audiology
• Speech-Language Pathology
• Perceptual Psychology

Background:

• Lipreading performance is crucial for communication in hearing-impaired individuals.
• Viseme perception, the ability to distinguish visually similar speech sounds, is a key component of lipreading.
• Existing assessment tools may not fully capture the nuances of viseme perception.

Purpose of the Study:

• To develop and validate a new instrument for assessing viseme perception in hearing-impaired young adults.
• To evaluate the reliability and validity of the instrument using item response theory.
• To explore the relationship between viseme perception scores and other communication characteristics.

Main Methods:

• Forty-six hearing-impaired young adults participated.
• A newly developed instrument using videotaped sentences with single-viseme differences was employed.
• Discrimination was tested across six visual categories (syllable pattern, consonant/vowel articulation, lip shape, jaw movement).
• Data were analyzed using the Rasch item response theory model.

Main Results:

• The test data demonstrated conformity to the Rasch model for person measurement.
• The instrument showed potential for assessing perceptual components of lipreading.
• Relationships between test scores and communication characteristics were explored.

Conclusions:

• The newly developed instrument shows promise as a tool for assessing viseme perception in hearing-impaired adults.
• The findings support the use of item response theory in evaluating such perceptual tests.
• Further development may enhance its utility in clinical and research settings.