What grid cells convey about rat location

Ila R. Fiete, Yoram Burak, Ted Brookings

Research output: Contribution to journalArticlepeer-review

175 Scopus citations


Wecharacterize the relationship between the simultaneously recorded quantities of rodent grid cell firing and the position of the rat. The formalization reveals various properties of grid cell activity when considered as a neural code for representing and updating estimates of the rat's location. We show that, although the spatially periodic response of grid cells appears wasteful, the code is fully combinatorial in capacity. The resulting range for unambiguous position representation is vastly greater than the ≈1-10 m periods of individual lattices, allowing for unique high-resolution position specification over the behavioral foraging ranges of rats, with excess capacity that could be used for error correction. Next, we show that the merits of the grid cell code for position representation extend well beyond capacity and include arithmetic properties that facilitate position updating. We conclude by considering the numerous implications, for downstream readouts and experimental tests, of the properties of the grid cell code.

Original languageAmerican English
Pages (from-to)6858-6871
Number of pages14
JournalJournal of Neuroscience
Issue number27
StatePublished - 2 Jul 2008
Externally publishedYes


  • Entorhinal
  • Hippocampus
  • Information
  • Navigation
  • Path integration
  • Spatial perception
  • Theory
  • dMEC


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