EEG has been studied in relation to several other disorders. For instance, increases in both alpha and beta power have been reported among individuals with depressive disorders (Knott, Mahoney, Kennedy, & Evans, 2001; Pollock & Schneider, 1990). Greater alpha power in the right hemisphere relative to the left, a measure with high internal consistency (Allen, Urry, Hitt, & Coan, 2004), seems to be a robust indicator of depression (Henriques & Davidson, 1990, 1991; D. J. Smit, Posthuma, Boomsma, & De Geus, 2007). Indeed, some have considered it a candidate endophenotype for the disorder (Stewart, Bismark, Towers, Coan, & Allen, 2010). Inter-hemispheric differences in power have also been observed among patients with bipolar disorder (Clementz, Sponheim, Iacono, & Beiser, 1994; Koek et al., 1999). A combination of increased slow-wave (delta and theta) power and decreased alpha power has been found in bipolar patients (Clementz et al., 1994) and even more reliably in patients with schizophrenia (Begic et al., 2011; Clementz et al., 1994; Harris, Melkonian, Williams, & Gordon, 2006; Sponheim, Clementz, Iacono, & Beiser, 1994, 2000; Sponheim, Iacono, Thuras, Nugent, &
