Nowadays, brain is explored through various methods as one of the most complex systems. FMRI technique is based on continuous change in brain blood oxygenated level and contributes remarkably to our understanding of its activity. Data collected by fMRI technique provides more comprehensive spatial information in comparison to other methods. The main goal of the study is analysis of criticality in brain by means of fMRI. In this study critical state is investigated by forming network of brain and applying a specific dynamic on it. Brain activity indicates multifractality in resting state in which the subject is still with closed eyes. Calculation of some fractal variables shows the same result for healthy and schizophrenic brain in resting state.
