EEG Aspects of Cognitive Processes: A Contribution to the Proteus-like Nature of Consciousness

Probability mapping of amplitude and coherence based on spectral analysis yields information on the cooperation of brain areas in cognitive processes. The method is based on comparing these two parameters during the performance of a mental task with the respective values of the EEG at rest. For each of 6 frequency bands spanning the entire EEG spectrum the data are represented on schematic brain maps with significant changes of amplitude (entered at the sites of the 19 electrodes) and coherence (between all respective electrodes). These maps have proven to be largely task-specific in both group and individual studies. They are considered to objectify electrical manifestations of differential attention. Le mapping de l'amplitude et de la coherence base sur l'analyse spectrale fournit de l'information sur la cooperation des regions cerebrales dans les processus cognitifs. La methode est fondee sur la comparaison de ces deux parametres au cours d'une tache mentale avec les valeurs respectives du EEG au repos...