Capturing continuous spectrotemporal pupil--brain coupling with simultaneous wearable EEG/Eye tracking

Wearable mobile EEG and eye tracking show frequency-dependent pupil–brain coupling, with low-band EEG (2–12 Hz) preceding pupil dynamics by about 764 ms.

• Why it matters: Prior pupil–brain coupling evidence largely comes from stationary lab setups, leaving uncertainty about whether the same spectrotemporal organization holds during continuous, naturalistic recording.
• What they did: In resting-state and during interoceptive attention, the study used simultaneous MUSE EEG and Tobii Pro Glasses 3 eye tracking, applying cross-correlation, mutual information, and Granger causality.
• The result: Analyses indicated predominantly EEG-to-pupil directional coupling and preserved coupling organization across recording states, supporting wearable systems for studying spontaneous pupil–brain interactions.

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