Investigated spatial thinking abilities of sixth- and tenth-grade students from two locales--a school on the Navajo reservation and schools in Mesa, Arizona. Overall findings support the contention that there were no substantial time delays or advances in development of selected spatial abilities of Navajo students compared to parallel non-Indian…

The development of children's causal knowledge is investigated by analyzing changes in the content and form of the explanations they generate across the age span of three to nine years. The balance of incremental versus fundamental change and the forms each takes in children coming to understand the working of gears are examined. Three phases of…

Spatial ability and Piagetian tasks were administered to 80 schooled/non-schooled Fulanis (primarily nomadic and hunters) and agriculturalists (living a settled life). Results indicated that Fulanis develop spatial skills adapted to the ecological demands of their lives and that schooled students performed better on Piagetian tasks than…

The concepts of distance, area, and the coordinate reference systems were investigated in relation to the displacement volume task among 300 randomly selected primary and high school children in Nigeria. Although results support Piaget's hypothesis, a developmental lag of about two years was observed in Nigerian students. (JN)