Attention cycles seven to ten times per second ^{CEFR B2}

Researchers report that attention operates in a rhythmic cycle, occurring about seven to ten times per second. Using EEG recordings, the team found patterns that aligned with moments when attention tended to move toward distractors. These rhythms corresponded to alternating windows of stronger and weaker detection of a target; during the weaker windows participants were more vulnerable to distraction.

The experiment, led by scientists at the University of Rochester and published in PLOS Biology, tested 40 participants. Subjects were asked to fixate on a dim grey square while coloured dots acted as distractors. The researchers removed any data with eye movements, ensuring the effects reflected internal shifts of attention rather than changes in gaze.

The authors give everyday examples — someone searching for a parked car still noticing a backing vehicle, or a watcher of a child on a bike spotting a low branch and ducking — and argue the rhythm may have helped ancestors detect danger. In the modern environment of laptops, smartphones and frequent visual alerts, those natural moments of lowered focus can increase vulnerability to distraction. The team suggests the findings could inform strategies to improve focus and notes that reduced alternation might relate to lower cognitive flexibility in people with ADHD. The work received support from the National Institutes of Health, the National Science Foundation and the Searle Scholars Program.