Harris Test of Lateral Dominance

Purpose: Designed to measure directional confusion.

Population: Children and adults.

Score: Total hand dominance rating.

Time: Not reported.

Author: Albert J. Harris.

Publisher: The Psychological Corporation.

Description: The author defines lateral dominance as the preferred use and better performance of one side of the body as compared to the other side. Dominance is said to be crossed when the dominant hand and dominant eye are on opposite sides. Hand dominance is called mixed or incomplete when the individual does not show a consistent preference for, or superiority of, one hand. The author claims that this battery, which consists of ten tests, are sensitive indicators of directional confusion.

Scoring: Test 1 measures subjectís knowledge of right and left; test 2 assesses hand preferences; test 3 assesses simultaneous writing; test 4 assesses handwriting; test 5 measures tapping; test 6 assesses card dealing ability; test 7 measures strength of grip; test 8 consists of monocular tests; test 9 consists of binocular tests; and test 10 involves stereoscopic testing. After the separate hand dominance tests have been rated, a total hand dominance rating is ascertained. The author states that this rating is a matter of qualitative judgment.

Reliability: The author states that a rough approximation of reliability coefficients can be obtained by the use of the coefficient of contingency. On this basis, the author states that the maximum value for the four hand dominance tests is .894. Split-half techniques yield Spearman-Brown reliability coefficients of .85 and .88. Test-retest reliabilities based on group administration in college classes yield coefficients ranging from .75 to .83.

Validity: The author claims that the nature of the tasks are appropriate for the purposes for which the test are intended. On this basis, he claims the tests evidence content validity. The author also asserts that the hand dominace tests are reliable and discriminitive measures which are more sensitive to mixed dominance and directional confusion than many previous sets of hand dominance tests.

Norms: The manual provides no information on norms.

Suggested Uses: Recommended uses include assessment of hand dominance or directional confusion in research and clinical settings.