The nul-hypothesis has been confirmed by the analysis of the study, in that they show no relationship between stuttering and unilateral dominance. The results indicate that the laterality measure of the experimental group did not differ significantly from that of the control group.

In as much as the results of only one statistical test were significant, it is felt that this does not detract from the contribution of the study. It would seem that the results obtained from this comparison, the analysis of overall visual adequacy and extremity dominance, could have occurred by chance alone. It is pointed out, however, that this test was distinctly different from all other tests performed; and it is felt that careful consideration should he given to this factor in a total evaluation of the results obtained.

The statistical analysis of the data compiled were done by way of the."t' test of significance, which included computation of the "t' statistic to test whether scores obtained on selected tests were statistically significant, and the Chi Square Test, which was used to determine the presence or absence of factors indicating a greater or less degree of dominance confusion.

The experimental and control groups were composed of a total of twenty subjects, who were administered The Harris Tests of Lateral Dominance, the Leavell Hand-Eye Coordinator Tests, and the Keystone Visual Survey; Tests for the purpose of exploring the relationship of measures of lateral dominance. On the basis of the results obtained from this investigation, the following conclusions seem warranted:

  1. Stuttering subjects do not show a higher incidence of extremity and ocular dominance confusion that do non-stuttering controls.
  2. The lack of unilateral dominance would not be considered a factor regarding lateral dominance as it relates to stuttering.
  3. A significantly greater proportion of stutterers were shown to have a visual inadequacy in association with extremity in-coordination and imbalance.
  4. Further research of the relationship of lateral dominance confusion and stuttering observed by more clinicians is needed.
  5. Further research in the development of instruments to assess lateral dominance is indicated.

[Keywords: Stuttering, Neurological Organization, Lateral Dominance, Mixed Dominance, Dominant Eye]

LLU Discipline

Speech Pathology


Speech-Language Pathology


Graduate School

First Advisor

Kenneth R. Lutz

Second Advisor

W. Fletcher Tarr

Third Advisor

R. Warburton Miller

Fourth Advisor

Katherine Mosier

Degree Name

Master of Science (MS)

Degree Level


Year Degree Awarded


Date (Title Page)




Library of Congress/MESH Subject Headings

Stuttering. Stuttering--Case studies; Stuttering--Child; Laterality; Laterality--Case studies.

Subject - Local

Loma Linda University. Speech-Language Pathology program -- Theses.



Page Count

viii; 73

Digital Format


Digital Publisher

Loma Linda University Libraries

Usage Rights

This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights.


Loma Linda University Electronic Theses and Dissertations

Collection Website



Loma Linda University. Del E. Webb Memorial Library. University Archives