Seven tests of laterality or sidedness were applied to a group of 80 subjects, 20 each of right-handed, left-handed, ambidextrous and stutterers. Except for the stutterers, the groups were classified on the basis of a laterality index questionnaire. A major purpose of the investigation was to determine whether or not a technique developed by Dallenbach (1, 2 and 3) for investigating conditions of visual clearness could be applied to naive observers. The essential point of the apparatus he used is an arrangement by which two areas of light are presented simultaneously to the subject who reports as to their comparative clearness or brightness. One of these remains at constant intensity, the other is variable. Only two areas, on opposite sides of the fixation point, were shown at any one time. By comparing these areas in the various positions the subject reveals his positional preference in the visual field in terms of the intensity of the stimulus. Dallenbach's right-handed observers (2) preferred the positions to the left and above fixation, his left-handed observer (1) the position to the right and below.
Proceedings of the Iowa Academy of Science
©1936 Iowa Academy of Science, Inc.
Morris, D. W.
"Interrelation of Seven Tests of Laterality,"
Proceedings of the Iowa Academy of Science, 43(1), 309-311.
Available at: https://scholarworks.uni.edu/pias/vol43/iss1/109