Extended Data Figure 9: Grid cell pattern in trapezoid cannot be predicted by a simple transformation of a square to a trapezoid.
From: Grid cell symmetry is shaped by environmental geometry

a, Panel shows 4 grid cells from 4 rats recorded in a square (left) and trapezoid (middle). Predicted grid pattern (right) obtained by transforming a grid recorded in a square (left) into a trapezoid. b, Correlation coefficients between the predicted morphed grid pattern and the one actually recorded in the trapezoid. The distribution is not significantly different from the normal distribution with a mean equal to zero (P = 0.74, t = −0.33, df = 36, one-sample t-test).