Publication Date


Document Type


First Advisor

Seaver, Earl J., III

Degree Name

M.A. (Master of Arts)

Legacy Department

Department of Communicative Disorders


Vowels; Consonants


The effect of vowel context on the visual perception of consonants was evaluated by employing a visual consonant identification task. Twenty consonants were produced in CV (Consonant-Vowel) syllables with each of the vowels /a,i,u/. Ten participants were presented with a video recording of these syllables, without an audio signal, and were asked to identify the stimulus consonants. An analysis of variance of the subjects' consonant identifications revealed that no significant difference was observed in the number of consonants perceived correctly within each vowel context. The consonants were then divided into ten homophenous clusters for further analysis. A second analysis of variance demonstrated a significant difference in the perception of the homophenous groups. The /u/ vowel context was found to be significantly less facilitating than the /a/ or /i/ contexts for dividing the consonants into homophenous categories. An information transfer procedure was utilized to evaluate the amount of information transmitted visually for the consonant production features of nasality, voicing, stop, affrication, duration, and place. The feature of place was found to be transmitted most effectively. Information concerning features of nasality and voicing were observed to be minimally transferred through visual perception. For the features of manner of production—stop, affrication and duration—information was moderately transmitted.


Bibliography: pages [63]-64.


vii, 64 pages




Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type