H. Petsche et Sc. Etlinger, EEG ASPECTS OF COGNITIVE-PROCESSES - A CONTRIBUTION TO THE PROTEUS-LIKE NATURE OF CONSCIOUSNESS, International journal of psychology, 33(3), 1998, pp. 199-212
Probability mapping of amplitude and coherence based on spectral analy
sis yields information on the cooperation of brain areas in cognitive
processes. The method is based on comparing these two parameters durin
g the performance of a mental task with the respective values of the E
EG at rest. For each of 6 frequency bands spanning the entire EEG spec
trum 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.