Abstract
Summary The errors of normal Ss in localizing points in a plane were investigated through a reproduction test with special reference to the possible existence of asymmetry in performance in the two halves of the plane. The test was given to two groups of 48 right-handed men and women, one from the U.S. and one from Italy. Each group was composed of younger and older subgroups of 24 Ss each. Within each age-nationality subgroup, 12 Ss performed the test with the preferred hand and 12 performed it with the nonpreferred hand. Both accuracy of performance and the direction of errors were analyzed. Performance was significantly more accurate in the left half of the plane. The analysis of the direction of errors demonstrated a main vertical downward error and a horizontal error toward the closer boundary of the plane. The results are discussed in view of the relevant literature.
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