A generalized perceptual space
Vasudevan Lakshminarayanan, R. Parthasarathy, K DeValoist, L.W. Chang · Neurological Research · 2000
Based upon experimental results on certain visual spatial discrimination tasks, we have developed a formalism for a non-Euclidian perceptual space. In this formalism, the transformation from real to perceptual space is given by a generalized covariant tensor. The concept of parallel transport of vectors in a curved space is used to prove that closed loops in real space imply closed loops with the same orientation in the perceptual space also.