摘要：SummarySwallowing is attributed to the orchestration of motor output and sensory input. We hypothesized that swallowing can illustrate differences between motor and sensory neural processing. Eight epileptic participants fitted with intracranial electrodes over the orofacial cortex were asked to swallow a water bolus. Mouth opening and swallowing were treated as motor tasks, whereas water injection was treated as a sensory task. Phase-amplitude coupling between lower-frequency and high γ (HG) bands (75–150 Hz) was investigated. An α (10–16 Hz)-HG coupling appeared before motor-related HG power increases (burst), and a θ (5–9 Hz)-HG coupling appeared during sensory-related HG bursts. The peaks of motor-related coupling were 0.6–0.7 s earlier than that of HG power. The motor-related HG was modulated at the trough of the α oscillation, and the sensory-related HG amplitude was modulated at the peak of the θ oscillation. These contrasting results can help to elucidate the brain's sensory motor functions.Graphical abstractDisplay OmittedHighlights•Swallowing has two aspects; sensory input and motor output•Phase-amplitude coupling showed differences of motor and sensory neural processing•Coupling between the α and high γ band occurred before motor-related high γ activities•Coupling between the θ and high γ band occurred during sensory-related high γ activitiesNeuroscience; Behavioral neuroscience; Sensory neuroscience.
