Summary
This review summarizes research on the neural mechanisms of spatial navigation, focusing on the hippocampus and entorhinal cortex. It highlights the discovery and functional characterization of place cells in the hippocampus and grid cells in the entorhinal cortex, which are fundamental to representing an animal's location and orientation within an environment. The work emphasizes how these cells interact to form a cognitive map, allowing for flexible and efficient navigation.
The review details how lesions or manipulations of these brain regions impair spatial memory and navigation. It discusses evidence for a systematic organization of place and grid cell activity, suggesting a computational framework for how the brain encodes spatial information. Understanding these circuits provides insights into the neural basis of memory, learning, and the perception of space.
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Key concepts
- Place cells — Neurons in the hippocampus that fire when an animal is in a specific location in an environment.
- Grid cells — Neurons in the entorhinal cortex that fire when an animal is at multiple locations arranged in a periodic hexagonal grid.
- Cognitive map — A neural representation of an environment that allows for flexible navigation and spatial reasoning.
- Entorhinal cortex — A brain region that relays information between the hippocampus and other cortical areas, critical for spatial memory.
- Hippocampus — A brain structure essential for forming new memories and spatial navigation.