A second characteristic of brain activity displayed by
respondents of the MM group was that several of the
EEG parameters analyzed showed an interaction effect
with the factor of brain areas, thus suggesting a more
intense involvement of the parieto-occipital brain areas
(e.g., in the parieto-occipital area less complex EEG patterns
were observed, in the lower-2 a band more ERS in
the frontal area and more ERD in the parieto-occipital
areas was observed). Several PET and fMRI studies have
shown that parieto-occipital brain areas play a central role
in spatial encoding and retrieval, as well as spatial perception
and imagery, while frontal areas are more involved in
monitoring and manipulating information held in the
working memory (for a review see, Cabeza and Nyberg,
2000). From this viewpoint the greater involvement of
the parieto-occipital brain areas could point to a more adequate
strategy use, which to a greater extent focused on the
figural information provided by the spatio-temporal
rotation tasks