Measuring structural complexity in brain images

 Complexity ?  Is a state of affairs that one can easily appreciate when confronted with it; however, is difficult to define it quantitatively.  We are after a quantity " C " that captures complexity as the entropy " H " captures randomness. The simple and the complex Complexity In between " perfect order " and " complete disorder " , complexity has to do with the existence of a certain degree of structure, temporal and/or spatial correlations hidden in the dynamics. Statistical complexity is often characterized by the paradoxical situation of a complicated dynamics being generated from relatively simple systems. One can begin by excluding processes that are not complex:  periodic motion  a purely random process The complexity of a system must reach a maximum between the system's perfectly ordered and perfectly disordered states.