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This research aims to investigate how visual speech cues affect cognitive effort during speech comprehension.

November 1, 2025eNeuroOpen Access

Visual Speech Reduces Cognitive Effort as Measured by EEG Theta Power and Pupil Dilation

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This research aims to investigate how visual speech cues affect cognitive effort during speech comprehension.
Participants completed a speech-in-noise task under auditory-only, audiovisual, and visual-only conditions.
Task difficulty was manipulated using different signal-to-noise ratios (SNR).
Data was collected using pupillometry and electroencephalography (EEG) to assess cognitive effort.
An inverted U-shape relationship between pupil dilation and frontal midline theta was observed with SNR.
Pupil dilation was greater in audiovisual conditions compared to auditory-only speech.
Neurophysiological measures peaked at lower SNR for audiovisual conditions.

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Experiment reveals audiovisual speech enhances comprehension at lower signal-to-noise ratios, highlighting neurophysiological changes.

Man et al. (2025) studied this question.

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