Ron W. Channell

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Masking level differences (MLDs) were investigated using masking noise with 160 Hz (amplitude-modulated noise) and 600 Hz (filtered-random noise) bandwidth. One hundred normally hearing subjects received the MLD test under both types of noise. Significant differences between noise types were observed in both N0S pi and N pi S0 conditions; MLDs were larger(More)
PURPOSE The present study examined the extent of genetic and environmental influences on individual differences in children's conversational language use. METHOD Behavioral genetic analyses focused on conversational measures and 2 standardized tests from 380 twins (M = 7.13 years) during the 2nd year of the Western Reserve Reading Project (S. A. Petrill,(More)
PURPOSE This study investigated the effect of age on articulatory movement and stability in young, middle-age, and older adults. It also examined the potential influence of linguistic complexity on speech motor control across utterances that differed in their length and grammatical complexity. METHOD There were 60 participants in 3 age groups: 20-30(More)
This study evaluated the reliability of pitch judgments as a basic step toward increasing interrater and intrarater reliability of multidimensional perceptual judgments of the speaking voice. Forty-five undergraduate university students studying speech/language pathology made piano-to-piano tone pitch matches and vowel-to-piano pitch matches using a(More)
This study examined the accuracy of fully automated Developmental Sentence Scoring (DSS; L. L. Lee, 1974) analysis performed by the Computerized Profiling (CP) software (S. H. Long, M. E. Fey, and R. W. Channell, 2000). Samples from 48 school-age children (28 with language impairment) yielded 9,084 utterances that were DSS coded both manually and by CP. The(More)
PURPOSE The existing literature on language outcomes in children born prematurely focuses almost exclusively on standardized test scores rather than discourse-level abilities. The authors of this study looked longitudinally at school-age language outcomes and potential moderating variables for a group of twins born prematurely versus a control group of(More)
PURPOSE In this study, the authors examined the validity of using materials from 2 nonregional yet mutually intelligible dialects to evaluate an individual's speech recognition threshold (SRT) and word recognition (WR) abilities and whether a speaker of 1 dialect could accurately administer and score materials in the other dialect. METHOD Previously(More)
OBJECTIVE The aim of this study was to develop and psychometrically evaluate speech audiometry materials that can be used to measure word recognition (WR) and speech recognition testing (SRT) in quiet for native speakers of Cantonese. STUDY SAMPLE Commonly used bisyllabic and trisyllabic Cantonese words were digitally recorded by native male and female(More)
This thesis has been read by each member of the following graduate committee and by majority vote has been found to be satisfactory. As chair of the candidate's graduate committee, I have read the thesis of Amy S. Leiter in its final form and have found that (1) its format, citations, and bibliographical style are consistent and acceptable and fulfill(More)
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