Fig. 5

ERSP maps and contrast maps for each cluster of AB and TFA. Time–frequency maps show the decrease (blue) and increase (red) in mean power for each condition. In the ERSP maps of AB and TFA, the non-significant differences from quiet stance are partially masked with a white overlay. The contrast maps display the difference in power between TFA and AB, the differences between − 1 and 1 dB are masked with a gray overlay. AB: able-bodied persons; TFA: persons with a transfemoral amputation; HsI: heel strike with intact/dominant leg; HsP: heel strike with prosthetic/non-dominant leg