Spatial Knowledge and Geometric Representation in a Child Blind from Birth

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Abstract
A series of experiments demonstrated that a congenitally blind 2.5 yr old child and sighted but blindfolded children and adults can determine the appropriate path between 2 objects after traveling to each of those objects from a 3rd object. This task requires that the child detect the distances and the angular relationship of the familiar paths and that she derive from them the angle of the new path. The research indicates that the locomotion of the young blind child is guided by knowledge of the Euclidean properties of a spatial layout and by principles for making inferences based on those properties.