Complexity - dependent synchronization of brain subsystems during memorization

In this article coherence analysis is used as an internal indicator of mental effort. Therefore, a working memory task was given as an external request. Test subjects had to memorize easy symbols. To obtain a complexity variation we only modified the number of symbols in three conditions (two, four and six symbols). Preliminary results show that coherence between functionally coupled brain subsystems reflect partial processes in course of complexity-dependent memorization of symbols. EEG analysis of coherence in frequency bands beta1 and theta shows different aspects of human information processes represented by different band characteristics.