Opposite Effects of Alpha Oscillations on Mind-Wandering With Eyes Open and Closed

Spontaneous fluctuations in brain activity are thought to underlie mind-wandering, moments when mental experience becomes unrelated to what one is currently doing. A large body of research has investigated ongoing neural oscillations in the alpha band (7-14 Hz), reflecting changes in arousal and attention. However, studies disagree whether the power of alpha oscillations increases or decreases during mind-wandering compared to on-task focus. We hypothesized that these opposite effects arise from differences in eye state across studies, as eye closure increases alpha power and can reverse alphas relationship with sleepiness, which is itself related to mind-wandering. To test this, we recorded EEG while male and female participants with eyes either open or closed were probed to report whether they were focused on the auditory attention task or mind-wandering, as well as how sleepy they were. Consistent with our hypothesis, we found that increased alpha power made both mind-wandering and sleepiness more likely in the eyes-open group but less likely in the eyes-closed group. A systematic review of past literature largely replicated these opposite relationships across eye states in different paradigms. We propose that these results reflect an inverted-U relationship between alpha power and mind-wandering, formed by a positive relationship at low alpha power values typical of eyes-open states and a negative relationship at high alpha power values typical of eyes-closed states. By sampling alpha power across eye states in the same paradigm, this work reconciles contradictions in prior literature and clarifies how ongoing neural oscillations reflect the stream of mental experiences. Significance StatementBrain signals tracked with electroencephalography (EEG) can provide a read-out of a persons current mental experience. Increases in a brain signal called alpha oscillations usually indicate sleepiness when recorded with eyes open. Surprisingly, the read-out can be reversed when eyes are closed: increases in alpha oscillations indicate alertness. Here, we found that this reversal explains the puzzling relationship between alpha oscillations and mind-wandering, when mental experience becomes unrelated to the task-at-hand. In moments of increased alpha, participants with eyes open reported more mind-wandering and sleepiness, whereas participants with eyes closed reported more on-task focus and alertness. One intriguing possibility is that decreases in arousal reflected by changes in alpha oscillations trigger episodes of mind-wandering.