New research from the University of South Florida examines how eye movements and brain activity coordinate during natural reading. The study, published in Psychophysiology and led by Elizabeth Schotter with first author Sara Milligan, combined an electroencephalogram (EEG) cap to record brain waves and a camera-based eye-tracking system to follow gaze. Linking these data allowed researchers to observe real-time, split-second decisions about which words to read or skip.
The experiment involved 55 participants. Each completed a tracked reading session of approximately two hours and silently read 180 sentences, pressing a button after each sentence. In some sentences the team manipulated upcoming words so they were expected, slightly altered, or unexpected. Because eye movements during reading occur roughly every 250 milliseconds, the researchers matched eye data to brain activity at high temporal resolution.
Results indicate that skipping a word does not mean it was ignored. Brain signals show readers often partially register skipped words in peripheral vision and can detect whether a word is expected or irregular. However, the choice to skip occurs before full word recognition, pointing to a rapid, predictive system that prioritizes efficiency. Milligan said readers “rely on detailed visual and linguistic processing.” The work required new tools and software to combine eye tracking with EEG and may inform reading instruction, interventions for reading difficulties, and future studies on skimming, comprehension, and individual differences across the lifespan.
- Tools: EEG cap and camera-based eye tracking.
- Design: 55 participants, ~two-hour sessions, 180 sentences each.
- Manipulations: upcoming words were expected, slightly altered, or unexpected.
Difficult words
- electroencephalogram — Recording of electrical activity in the brain.
- eye tracking — Technology that records where eyes look.eye-tracking
- manipulation — Deliberate change of something for testing.Manipulations
- peripheral — Located at the edge of the visual field.
- temporal resolution — Ability to detect very brief time differences.
- predictive — Using expectations to anticipate upcoming events.
- skip — Decide not to read a particular word.skipping, skipped
Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.
Discussion questions
- How could combining eye tracking with EEG change the way teachers assess reading skills?
- What are the possible benefits and risks of relying on a predictive system when people skim texts?
- How might individual differences across the lifespan affect the ability to skip words without losing comprehension?
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