Outcome data.

Control weeks: 2 weeks period immediately preceding treatment with either 4-AP or t-butyl; OFS: open field score (0–13); SS: stepping score; RI: regularity index; DNI: decreased (−1), no change (0), improved (+1); HL: hind limb; ßk0: treatment effect of 4-AP or t-butyl relative to control; ßk1: relative treatment effects of 4-AP and t-butyl. Positive values of ßk1 reflect outperformance by 4-AP, and negative values reflect t-butyl. The scores denoted with * were not changed by treatment, therefore ßk0 and ßk1 values could not be calculated. Outcome data.