Interacting networks of brain regions underlie human spatial navigation: a review and novel synthesis of the literature

Author:

Ekstrom Arne D.123,Huffman Derek J.1,Starrett Michael12

Affiliation:

1. Center for Neuroscience, University of California, Davis, California

2. Department of Psychology, University of California, Davis, California

3. Neuroscience Graduate Group, University of California, Davis, California

Abstract

Navigation is an inherently dynamic and multimodal process, making isolation of the unique cognitive components underlying it challenging. The assumptions of much of the literature on human spatial navigation are that 1) spatial navigation involves modality independent, discrete metric representations (i.e., egocentric vs. allocentric), 2) such representations can be further distilled to elemental cognitive processes, and 3) these cognitive processes can be ascribed to unique brain regions. We argue that modality-independent spatial representations, instead of providing exact metrics about our surrounding environment, more often involve heuristics for estimating spatial topology useful to the current task at hand. We also argue that egocentric (body centered) and allocentric (world centered) representations are better conceptualized as involving a continuum rather than as discrete. We propose a neural model to accommodate these ideas, arguing that such representations also involve a continuum of network interactions centered on retrosplenial and posterior parietal cortex, respectively. Our model thus helps explain both behavioral and neural findings otherwise difficult to account for with classic models of spatial navigation and memory, providing a testable framework for novel experiments.

Funder

HHS | NIH | National Institute of Neurological Disorders and Stroke (NINDS)

NSF | SBE | Division of Behavioral and Cognitive Sciences (BCS)

Publisher

American Physiological Society

Subject

Physiology,General Neuroscience

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