The Minnesota Percepto-Diagnostic Test-Revised (MPDT-R) and the Comprehensive Test of Basic Skills were administered to 40 Navajo, 40 Papago, 40 Hopi, and 40 Caucasian children. All of the children were in regular classrooms, but the results of a one-way analysis of variance indicated significant differences among the four groups on the MPDT-R rotation scores and two of the three configuration scores. (JPS)