Une épreuve opératoire africaine : Le Banagolo et ses rapports avec les tests opératoires formels

A logical african test: the banangolo and its relations to logical formal tests - The « Banangolo » is a symbolic outline executed by the forefinger and the middle finger in some African countries. Its purpose is diagnostic. But it also has an anatomic and cosmic meaning. It mainly appears related to sensori-motor activities. Facts show that as with Malian and Aquitaine children the mastery of this outline is not fully achieved until they are eleven- twelve years old. But, after abstracting temporal and spatial meanings, it is possible to represent the sensori-motor processes which allow the outline by an expression of propositional logic : non exclusive disjunction. So, the Banangolo could be used as a psychotechnical test of development. Comparisons made with some tests of propositional logic figuring in Longeot 's tests seem to bring positive arguments to this use.