biostudies-literatureUnknown42(11)Biau EDuring multisensory speech perception, slow δ oscillations (∼1-3 Hz) in the listener's brain synchronize with the speech signal, likely engaging in speech signal decomposition. Notable fluctuations in the speech amplitude envelope, resounding speaker prosody, temporally align with articulatory and body gestures and both provide complementary sensations that temporally structure speech. Further, δ oscillations in the left motor cortex seem to align with speech and musical beats, suggesting their possible role in the temporal structuring of (quasi)-rhythmic stimulation. We extended the role of δ oscillations to audiovisual asynchrony detection as a test case of the temporal analysis of multisensory prosody fluctuations in speech. We recorded Electroencephalograph (EEG) responses in an audiovThe Journal of neuroscience : the official journal of the Society for Neuroscience2313-2326https://www.ebi.ac.uk/biostudies/studies/S-EPMC8936602biostudies-literatureLeft Motor δ Oscillations Reflect Asynchrony Detection in Multisensory Speech Perception.PMC8936602Kotz SABiau EGunter TCSchultz BGfalseLeft Motor δ Oscillations Reflect Asynchrony Detection in Multisensory Speech Perception.During multisensory speech perception, slow δ oscillations (∼1-3 Hz) in the listener's brain synchronize with the speech signal, likely engaging in speech signal decomposition. Notable fluctuations in the speech amplitude envelope, resounding speaker prosody, temporally align with articulatory and body gestures and both provide complementary sensations that temporally structure speech. Further, δ oscillations in the left motor cortex seem to align with speech and musical beats, suggesting their possible role in the temporal structuring of (quasi)-rhythmic stimulation. We extended the role of δ oscillations to audiovisual asynchrony detection as a test case of the temporal analysis of multisensory prosody fluctuations in speech. We recorded Electroencephalograph (EEG) responses in an audiov2022-01-01T00:00:00Z2022 Mar2025-04-05T16:10:38.76Z2025-04-05T16:10:38.76ZS-EPMC89366023508690510.1523/JNEUROSCI.2965-20.202210.1523/jneurosci.2965-20.2022