Extended Data Fig. 9: Rate maps from all recordings with stepwise increases in length, diameter or height of the object.

a, Colour-coded firing rate maps of all 24 cells recorded in experiments in which objects were elongated in one dimension. Each row of four rate maps shows one cell. The four maps are scaled to the same maximum rate (common colour scale). Mouse and cell ID numbers are indicated to the left of each row. Fifteen cells were recorded while the length of the object was increased in steps from 6.75 cm to 62.5 cm. Nine cells were recorded while the length of the object was changed in the opposite direction, from 62.5 cm to 6.75 cm (cells indicated by arrows to the right). For some cells (for example, cells 862 and 927), firing fields increased in length as the object was extended; for other cells (for example, cells 1079 and 1042), the fields retain similar sizes and shapes across the entire spectrum of object lengths. b, Rate maps showing object-vector cell in experiment with no gap between internal and external walls (middle, right). c, Firing rate maps of 6 out of 23 cells recorded in experiments in which the diameter of a cylindrical object was increased from 2 cm to 20 cm. Note persistence of firing fields with increasing diameter of the object. Scale bar indicates colour-coded firing rate. d, Firing rate maps of 7 out of 21 cells recorded in experiments in which the height of prismatic object was increased from 2 cm to 40 cm. Colour-coded firing rate is indicated by scale bar.