Tversky, B., Stanford University, USA
Spatial knowledge derives from many sense modalities, is essential for survival, and is a basis for other knowledge. Each of us is a 3-D body operating in a 3-D world. We perceive and behave in different spaces to be described in detail: the space of our bodies, the space immediately surrounding us, the space we navigate, and the space of graphics. Both our bodies and the world have natural asymmetries that affect perception of and behavior in these spaces, yielding mental or external representations of them that systematically differ from space as measured by geographers or physicists.