[A two-dimensional statistic method for analysis of patient strategies in biofeedback mode]

Analysis of experimental trajectories in temperature-myographic BFB-training is considered. Analysis of point density on the phase plane (first of all, the states of extreme density points with respect to some basic thresholds) makes it possible to determine the main tendencies in the development of the training process. It also provides an opportunity to obtain a qualitative conclusion about the efficacy of BFB-training. There are three different ways for analysis of experimental points. The first way consists in constructing a general (or integral) picture, which can be obtained by reconstructing the point density for all experimental points measured during a single session. The integral picture shows the number of density peaks and their position on the plane, the sojourn time of the system at one or another part of the phase plane, etc. The second way is the analysis of time series of density values during a single session of training. The first density value corresponds to the basic state of the patient. Analysis of the density dynamics makes it possible to determine the character and tendencies of the strategies used by the patient during the session. The third way is the analysis of time series of integral pictures, which can be obtained upon finishing all training sessions. It provides an opportunity to draw a final conclusion about the efficacy of training in general. The analysis made it possible to divide the group of experimental trajectories into several subdomains. The first subgroup contained the trajectories corresponding to BFB-training based on both monitoring parameters (temperature and myogram). The second and third subgroups contained the trajectories corresponding to BFB-training based on one or another monitored parameter. The last group contained the trajectories used without success.