Table 1.
Comparison of firing field characteristics for place and grid cells on apparati of differing form and dimensionality.
| Place fields | Grid fields | ||||||
|---|---|---|---|---|---|---|---|
| n | Mean | s.e.m | n | Mean | s.e.m | ||
| Peak firing rate (Hz) | Flat arenas | 53 | 9.8 | 0.9 | 23 | 7.8 | 1.4 |
| Pegboard | 40 | 5.1 | 0.5 | 17 | 5.6 | 1.3 | |
| Helix | 103 | 10.3 | 0.7 | 53 | 9.5 | 1.0 | |
| Major axis/height (cm) | Flat arenas | 53 | 38 | 2 | 23 | 52 | 5 |
| Pegboard | 40 | 78 | 3 | 17 | 98 | 4 | |
| Helix (5-coil) | 50 | 63 | 2 | 53 | 69 | 1 | |
| Helix (6-coil) | 53 | 75 | 2 | - | - | - | |
| Helix (all) | 103 | 69 | 2 | 53 | 69 | 1 | |
| Minor axis/ width (cm) | Flat arenas | 53 | 21 | 1 | 23 | 35 | 4 |
| Pegboard | 40 | 39 | 3 | 17 | 38 | 3 | |
| Helix (5-coil) | 50 | 35 | 3 | 53 | 28 | 2 | |
| Helix (6-coil) | 53 | 45 | 4 | - | - | - | |
| Helix (all) | 103 | 40 | 2 | 53 | 28 | 2 | |
| Aspect ratio | Flat arenas | 53 | 2.0 | 0.1 | 23 | 1.5 | 0.1 |
| Pegboard | 40 | 2.4 | 0.2 | 17 | 3.0 | 0.4 | |
| Helix (5-coil) | 50 | 2.2 | 0.1 | 53 | 2.9 | 0.1 | |
| Helix (6-coil) | 53 | 2.1 | 0.1 | - | - | - | |
| Helix (all) | 103 | 2.1 | 0.1 | 53 | 2.9 | 0.1 | |
| Skaggs info (total bits/spike) | Flat arenas | 53 | 1.63 | 0.10 | 23 | 1.00 | 0.09 |
| Pegboard | 40 | 1.16 | 0.10 | 17 | 0.77 | 0.07 | |
| Skaggs info (horiz. bits/spike) | Flat arenas | 53 | 0.66 | 0.07 | 23 | 0.29 | 0.04 |
| Pegboard | 40 | 0.66 | 0.09 | 17 | 0.55 | 0.06 | |
| Skaggs info (vert. bits/spike) | Flat arenas | 53 | 0.58 | 0.05 | 23 | 0.25 | 0.03 |
| Pegboard | 40 | 0.29 | 0.03 | 17 | 0.17 | 0.03 | |