“…Oscillations in the theta band are thought to reflect top-down influences related to working memory and memory retrieval (Klimesch, 1999;Sauseng et al, 2005;Demiralp et al, 2007;Sauseng et al, 2010), and are linked to the activation of autobiographical memories (Steinvorth et al, 2010) as well as to mental time travel (Lavallee and Persinger, 2010) and, more generally, to the level of mental workload (So et al, 2017). While these aspects of theta oscillations could be related to mind-wandering, multiple reports show enhanced theta power in mindfulness meditators, as well as in meditators following other contemplative traditions (Lagopoulos et al, 2009;Xue et al, 2014;Lomas et al, 2015;Harne and Hiwale, 2018). Furthermore, frontal theta oscillations are inversely correlated with default mode activity, suggesting that these oscillations signal episodes of sustained attention (Scheeringa et al, 2008).…”