Figure 3.

Grid cell periodic spatial tuning on the circle track is reduced following scopolamine administration. A & B. Spatial tuning of two representative grid cells shown in the pre-injection open field screening trial (left column) and on the circle track before and after the systemic scopolamine injection (2^nd and 3^rd columns) showing a reduction in the spatial periodicity of the firing following the injection. The tuning 6 hrs after the injection are shown (4^{th -} 5^th columns) to reflect the recovery of the spatially periodic tuning.