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Grid cells recorded in the parahippocampal formation of freely moving rodentsprovide a strikingly periodic representation of self-location whose underlyingmechanism has been the subject of intense interest. Our previous work(1) showedthat grid cells represent the most stable subset of a larger continuum ofspatially periodic cells (SPCs) which deviate from the hexagonal symmetryobserved in grid cells. Recently Navratilova et al(2) suggested that ourfindings reflected poor isolation of the spikes from multiple grid cells,rather than the existence of actual non-grid SPCs. Here we refute thissuggestion by showing that: (i) most SPCs cannot be formed from hexagonalgrids; (ii) all standard cluster isolation measures are similar betweenrecorded grid cells and non-grid SPCs, and are comparable to those reported inother laboratories; (iii) the spikes from different fields of band-like SPCs donot differ. Thus the theoretical implications of the presence of cells withspatially periodic firing patterns that diverge from perfect hexagonality needto be taken seriously, rather than explained away on the basis of hopeful butunjustified assumptions.

Spatially Periodic Cells Are Neither Formed From Grids Nor Poor Isolation