Fig. 5

Diagram of the proposed structure to detect different groups of subjects based on the CoP trajectory and identified sensory contributions. a A subject will stand as still as possible on the force plate. b the CoP trajectory is measured in different trials of standing on stable and unstable surfaces with eyes open and closed c the data is filtered, and by DWT, features of the signal are extracted. By the k-means algorithm, the data of all participants are clustered into three groups. d based on the sensorimotor functions, FrC and their balance performance, and with utilizing the multinomial logistic classification method, the relationship between each group of subjects and their decline in sensorimotor functions and balance performance is detected