ERIC Number: EJ848541
Record Type: Journal
Publication Date: 2009-Jun
Abstractor: As Provided
Reference Count: 0
Spectral Tilt Change in Stop Consonant Perception by Listeners with Hearing Impairment
Alexander, Joshua M.; Kluender, Keith R.
Journal of Speech, Language, and Hearing Research, v52 n3 p653-670 Jun 2009
Purpose: To evaluate how perceptual importance of spectral tilt is altered when formant information is degraded by sensorineural hearing loss. Method: Eighteen listeners with mild to moderate hearing impairment (HI listeners) and 20-23 listeners with normal hearing (NH listeners) identified synthesized stimuli that varied in second formant (F[subscript 2]) frequency and spectral tilt. Experiments 1 and 2 examined utterance-initial stops (/ba/ and /da/), and Experiments 3 and 4 examined medial stops (/aba/ and /ada/). Spectral tilt was manipulated at either consonant onset (Experiments 1 and 3), vowels (Experiments 2 and 4), or both (Experiment 5). Results: Regression analyses revealed that HI listeners weighted F[subscript 2] substantially less than NH listeners. There was no difference in absolute tilt weights between groups. However, HI listeners emphasized tilt as much as F[subscript 2] for medial stops. NH listeners weighted tilt primarily when F[subscript 2] was ambiguous, whereas HI listeners weighted tilt significantly more than NH listeners on unambiguous F[subscript 2] endpoints. Conclusions: Attenuating changes in spectral tilt can be as deleterious as taking away F[subscript 2] information for HI listeners. Recordings through a wide dynamic range compression hearing aid show compromised changes in spectral tilt, compressed in range by up to 50%.
Descriptors: Phonemes, Hearing Impairments, Acoustics, Auditory Perception, Assistive Technology, Experiments
American Speech-Language-Hearing Association (ASHA). 10801 Rockville Pike, Rockville, MD 20852. Tel: 800-638-8255; Fax: 301-571-0457; e-mail: email@example.com; Web site: http://jslhr.asha.org
Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Authoring Institution: N/A