Which type of speech recognition materials is most appropriate to help rule out a retrocochlear lesion by using open-set, phonetically balanced word lists presented at several intensity levels?

• A. Closed-set monosyllabic and bisyllabic words that vary in stress pattern
• B. Closed-set sentences approximating natural syntax, administered in varying intensity levels as in an ongoing message
• C. Open-set, monosyllabic, phonetically balanced word lists that are representative of the patient's language
• D. Open-set, monosyllabic, phonetically balanced word lists, administered at several intensity levels

Answer: (D)

To assess retrocochlear pathology, the test should minimize contextual cues and allow a pure phonemic identification task across a range of loudness levels. Open-set, monosyllabic, phonetically balanced word lists let the patient respond with any word, providing a true measure of speech recognition without guessing from clues. Using phonetically balanced words ensures that every phoneme is represented fairly, so errors reflect processing at the auditory nerve level rather than language or vocabulary limits. Presenting these lists at several intensity levels is crucial because retrocochlear lesions often produce a rollover effect—performance declines as intensity increases—which helps distinguish retrocochlear involvement from cochlear or purely sensory limits. Closed-set materials or sentences add contextual cues or redundancy that can mask such deficits, making them less sensitive for ruling out retrocochlear pathology.