Date of Award


Degree Name

Master of Arts


Speech, Language and Hearing Sciences


Speech Pathology and Audiology

First Advisor

Dr. Charles Van Riper

Access Setting

Masters Thesis-Open Access



The problem as set forth in this thesis is to determine the correspondence of error between the voiced and unvoiced cognates "s" and "z" in children with articulatory disorders. It has been assumed that the correspondence of error type would be high due to the similarity of the sounds. Anderson, for example, says that "much of what is true with respect to "s" applies with equal force to its voiced analogue "z"." The problem of this research is to determine whether there is any correspondence between the respective errors on the sibilants "s" and "z" and if they correspond to each other significantly. An attempt will also be made to determine any consistency that occurs between the frontal lisp type errors (the substitution of "o" for "s" and ")" for "z") when the initial type error is that of frontal or interdental lisping.