08a+LORETA

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The data are in agreement with other neuroimaging techniques (fMRI/PET) investigating the DNt of brain function and further shows that the 3-dimensional localization accuracy of LORETA EEG is sufficient for the study of the DNt. In examining both within and between functional core regions there is a higher degree of activity in lower frequency bands during eyes closed; however, this pattern does not extend to all ROIs in the higher frequencies. We conclude that this difference represents functional connectivity relating to endogenous/exogenous attention states as opposed to the simple concept of "resting" or "non-activity". Further study of the functional relationships between EEG frequencies within and between the default core of the cortex may prove important to understanding the complex nature of functional integration Increasing knowledge of the functional dynamics of the DNt may be aided by studying the Electroencephalogram (EEG) in the DNt since it provides very good temporal resolution in milliseconds [1] and with the advent of EEG source localization techniques [13, 14] it is possible to explore EEG activity in neocortical and limbic regions associated with DNt. Low-resolution electromagnetic tomography (LORETA) and the standardized version (sLORETA) are inverse solutions that have been validated as accurate for estimating the potential sources of the scalp EEG [15-20].