Fig. 2 illustrates a pattern of higher alpha coherence in the LTAA vs. NSAC that is related to rs-fMRI NAcc seed connectivity. We also observed lower theta coherence between midline (Cz, FCz, Fz, CPz) and mostly left ipsilateral electrodes (Fp1, PO5, PO7, CB1, O1, AF3, PO3, FC2, CP2, AF4) in LTAA vs. NSAC, and higher coherence between most electrodes with Fp2, F6, and T8 (see Fig. 2). Although alpha was once attributed to an inactive or “idling” brain, more recently the presence of alpha has been attributed to the suppression of brain responses to distractors and absence of bottom up processing (von Stein and Sarnthein, 2000, Ward, 2003). Theta-modulated gamma oscillations have been recorded (Canolty et al., 2006, Jensen and Colgin, 2007) and have been proposed as a model for short-term memory (Lisman and Idiart, 1995, Ward, 2003). Moreover, theta coherence between frontal and posterior association regions has been shown to increase during the retention period of working memory tasks (Sarnthein et al., 1998). Increasing theta coherence was also found during a mental imagery task (Petsche et al., 1997). These
