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The processing and representation of motion information is addressed from an integrated perspective comprising lowlevel signal processing properties as well as higher-level cognitive aspects.For the low-level processing of motion information we argue that a fundamental requirement is the existence of a spatiotemporal memory. Its key feature, the provision of an orthogonal relation between external time and its internal representation, is achieved by a mapping of temporal structure into a locally distributed activity distribution accessible in parallel by higher-level processing stages. This leads to a reinterpretation of the classical concept of "iconic memory" and resolves inconsistencies on ultra-short-time processing and visual masking.The spatio-temporal memory is further investigated by experiments on the perception of spatio-temporal patterns. Resuits on the direction discrimination of motion paths provide evidence that information about direction and location are not processed and represented independant of each other. This suggests a unified representation on an early level, in the sense that motion information is internally available in form of a spatio-temporal compound.For the higher-level representation we have developed a formal framework for the qualitative description of courses of motion that may occur with moving objects. Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/15/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx 129 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/15/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx