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Aspects Of Vowel Perception By Normal Hearing And Hearing Impaired Listeners., Joan Marie Besing
Aspects Of Vowel Perception By Normal Hearing And Hearing Impaired Listeners., Joan Marie Besing
LSU Historical Dissertations and Theses
The effect of durational differences on the identification of vowel tokens was studied using ten normal hearing and six hearing impaired subjects. Stimuli were synthetically generated and varied in duration of the steady state, durations of the initial and final transitions and F1/F2/F3 location. Listeners were required to identify the given vowel token from a set of ten possible alternatives. The results from the normal hearing group supported the established effects of duration on the perception of vowels. However, these effects were different depending on the frequency locations of F1/F2/F3. Further, changes in the duration of the initial transition had …
The Time Course Of Acoustic/Phonemic Cue Integration In The Sensorineural Hearing-Impaired., Donald Joseph Schum
The Time Course Of Acoustic/Phonemic Cue Integration In The Sensorineural Hearing-Impaired., Donald Joseph Schum
LSU Historical Dissertations and Theses
It has been documented that phonemic featural information is differentially distributed across time in the speech waveform. It is also known that listeners with sensorineural hearing impairment often make errors on phoneme identification tasks. However, there is little documentation available that describes how the hearing-impaired listener uses the various sources of phonemic information which are distributed in the speech waveform. In this investigation, a group of normal hearing listeners and a group of sensorineural hearing-impaired listeners (with and without the benefit of amplification) identified various consonant and vowel productions that had been systematically varied in duration. The consonants (presented in …
Constancy Of (Acoustic) Relative Timing Measures In The Fluent Utterances Of Stutterers And Nonstutterers., Phoebe Cooper Weaver
Constancy Of (Acoustic) Relative Timing Measures In The Fluent Utterances Of Stutterers And Nonstutterers., Phoebe Cooper Weaver
LSU Historical Dissertations and Theses
Stuttering and nonstuttering children's articulatory timing abilities as measured by duration differences were compared as rate, stress and phonetic complexity were varied and both internal and external timing sources were used. Use of external timing sources resulted in within normal limit performance by the stutterers as compared to their nonstuttering peers. Significant average intrasubject variability occurred on phonetic complexity tasks involving a variable linguistic sentence and its reiterative counterpart and on a syllable expansion through clustering task. Use of internal timing sources resulted in within normal limit performance by the stutterers on both rate tasks but on only one of …
Production And Evaluation Of Rapid Serological Detection Methods For Identification Of Vibrio Vulnificus And Vibrio Cholerae., Janet Gibson Simonson
Production And Evaluation Of Rapid Serological Detection Methods For Identification Of Vibrio Vulnificus And Vibrio Cholerae., Janet Gibson Simonson
LSU Historical Dissertations and Theses
Species within the genus Vibrio can be identified serologically through detection of species specific H antigens expressed in the core protein of the polar flagella. Cholera vibrios also exhibit a specific cell wall polysaccharide antigen (A). Antibody reactive with these specific antigens can be employed for the rapid serological identification of Vibrio isolates. Species-specific anti-H sera were produced in rabbits immunized with flagellar core protein prepared from V. vulnificus. A coagglutination reagent was constructed by arming S. aureus Cowan I cells with the anti-V. vulnificus flagellar antibody. The reagent coagglutinated 99.3% of isolates identified bacteriologically as V. vulnificus and, other …
An Initial Identification Of Parasite Specific Immune Responses In The Jird (Meriones Unguiculatus) Infected With Brugia Pahangi., Rita Gaskin Farrar
An Initial Identification Of Parasite Specific Immune Responses In The Jird (Meriones Unguiculatus) Infected With Brugia Pahangi., Rita Gaskin Farrar
LSU Historical Dissertations and Theses
Brugia pahangi infections in the jird (Meriones unguiculatus) is an accepted experimental model for the study of human lymphatic filariasis. Initial identification of parasite specific immune responses in jirds infected with B. pahangi are reported here. Antibody reactivity in sera from singly and multiply infected jirds against different stages of B. pahangi was determined using an indirect fluorescent antibody technique. All life cycle stages of the parasite were examined. Antibodies recognizing all stages were present in all serum samples. Removal of antibody reactivity by absorption of jird sera with B. pahangi antigen coated beads indicated that the antibodies were parasite …
The Effects Of Marginal And Severe Dietary Magnesium And Copper Deficiencies On Immune Function., Marlene Marie Most Windhauser
The Effects Of Marginal And Severe Dietary Magnesium And Copper Deficiencies On Immune Function., Marlene Marie Most Windhauser
LSU Historical Dissertations and Theses
Throughout history, people speculated that an association existed between nutrition and disease prevention. Recently, studies have examined the influence of single nutrients on immunological mechanisms, but with limited focus on marginal deficiencies. This project investigated the effects of severe, marginal, and adequate levels of dietary magnesium and copper on immune function. Three experiments were conducted, with 100 gm male rats consuming one treatment diet for three, four or eight weeks. Mineral levels used were: (1) magnesium--50 ug/gm, 160 ug/gm, 280 ug/gm, 400 ug/gm; (2) copper--0.5 ug/gm, 2.0 ug/gm, 3.5 ug/gm, 5.0 ug/gm; or (3) a combination of the severely deficient …