The final section of the book tries to integrate the hypothesis derived from the preceding sections. The main question is, How do the parietal cortex and the hippocampus cooperate to master the requirements for spatial orientation? The preliminary answer is based on an earlier hypothesis developed by Ungerleider and Mishkin, who stated that visual information is processed along parallel ventral and dorsal streams, which are concerned, respectively, with what objects are present and where they are. Taking into account the empirical evidence derived from the Parietal Cortex section of the book, the chapter authors hypothesize that the parietal cortex, as part of the dorsal stream, codes for the spatial location of objects in an "egocentric" framework (appropriate for orienting the body or hands to a particular object, for example). The hypothesis is extended by considering that hippocampal and parahippocampal structures, at the meeting point of both streams, might be concerned with the representation of object locations within an allocentric framework (appropriate for encoding the relative position of relevant objects, for example). Only a close cooperation of both systems would enable the individual to "overlay" and integrate the relevant egocentric and allocentric frameworks. This is the most important prerequisite for performing many of the complex spatial tasks successfully. The results of the chapters presented in this section—approaching the subject again from different methodological angles—convincingly support the proposed integrative model of spatial cognition.