, which is the Spanish adaptation of the Rotation of Solid Figures developed by Thurstone and Thurstone (1949) a 3-D mental rotation test, loading in the factor of spatial relations, as cited in (Delgado and Prieto 1996 p.506). The experiment I ran is closely related to Vandenberg and Kuses study done in 1978. Vandenberg and Kuse (1978) studied spatial visualization ability among females and males in three different age groups, University students, high school students and elementary school students. They measured this using a paper and pencil test of spatial visualization that was constructed from two dimensional drawings of three dimensional figures which were taken from the chronometric study of Shepard and Metzler (1971) as cited in (Vandenberg and Kuse 1978). A consistent sex difference over the entire range of ages was found and the visual spatial ability was found to be significantly higher in males over females for all three age groups. (Vandenberg and Kuse 1978). With in my test I expect to find a difference in the visual spatial ability of males verse females. Males should perform significantly higher then females. In this study I also look for the effect of practice and whether or not it has a positive effect in increasing the accuracy of the score and if there is a difference in practice effect on males verse females. MethodParticipantsThirty female and 9 male undergraduate students from the three Research Methods Lab courses at Keene State College participated in the experiment as part of their course requirements. All were between the ages of 19 and 48 with a (mean age of 21.8 years), also all have some interest in the field of Psychology and will receive participation points towards their grade in research methods course.MaterialsCopies of Vandenberg and Kuses Mental Rotation Test designed at the University of Colorado, July15, 1971 and revised by H. Crawford of University of Wyoming September, 1979 were given out...