Abstract

Objective: We investigated the construct validity of Benton's hypothesis that both verbal and nonverbal components contribute to right-left orientation ability. Method: Independent factor scale components of Bentonian visual naming ability were available from previous research. They were refactored with age and educational level. Factor scales were created for the resulting components. Results were refactored again with the four components of the WAIS-III. Finally these third order principal components were refactored once again with the Judgment of Line Orientation Total Score (JLO-TOT) and the Right-Left Orientation Test (RLO) self-referenced items (1–12) and the RLO confronting examiner items (13−20). Results: The final factor solution produced four orthogonal factors that explained 71.67% of the variance. Factor one had loadings on WAIS-III Verbal Comprehension, the Visual Naming-1 component, educational level, and RLO items 13−20. The second factor had loadings on WAIS-III Processing Speed and RLO items 1−12. The third factor had loadings on WAIS-III Perceptual Organization, the Visual Naming-2 component, age, and JLO-TOT. The fourth factor had loadings on WAIS-III Working Memory and JLO-TOT. Conclusion(s): These findings support Benton's hypothesis that RLO performance is factorally related to component measures of verbal naming, visual-spatial perception, and both verbal and nonverbal intelligence. Consideration of RLO component performance in clinical practice should include component measures of visual naming, visual spatial perception, and both verbal and nonverbal intellectual ability.