A, top, recordings were made from Purkinje cells from mouse cerebellar slices from weanlings (P21–24). Sample recordings from WT (middle, black) and SCA684Q/84Q Purkinje cells (bottom, orange). B, auto‐correlograms from spike trains from representative neurons show that both WT (top, black) and SCA684Q/84Q (orange, bottom) Purkinje cells display highly regular firing patterns in weanlings. C, no significant changes are observed in the firing frequencies in WT and SCA684Q/84Q Purkinje cells (P = 0.34). D, spike regularity, as measured by CV2, is unchanged in WT and SCA684Q/84Q Purkinje cells (P = 0.32). Comparisons made by Student's t test; ns: P > 0.05.