Overview
- A peer-reviewed study published July 27, 2026 in the Journal of Neuroscience found that whether participants had their eyes open or closed completely reversed how alpha-band (7–14 Hz) activity relates to mind wandering.
- Researchers recorded EEG during simple auditory attention tasks while adults reported their alertness and sleepiness, comparing eyes-open and eyes-closed conditions to isolate the effect of eye state.
- With eyes open, rises in alpha power reliably preceded episodes of mind wandering and subjective sleepiness, showing alpha increases signaled reduced external attention.
- With eyes closed, the same alpha increases tracked focused, alert internal attention and lower rates of task-unrelated thought, leading the authors to propose an inverted-U model linking alpha power to task-unrelated thought.
- The result resolves long-standing conflicting findings about alpha oscillations and warns that EEG-based attention or drowsiness detectors and brain–computer interfaces must include eye-state and baseline brain context to avoid misclassification.