The Motor Imagery Based on Action Observation Treatment on Dysphagia in Wallenberg Syndrome

The goal of this clinical trial is to learn about on dysphagia in wallenberg syndrome. The main questions it aims to answer are: * the efficacy of motor imagery based on action observation treatment in the rehabilitation of patients with dysphagia in Wallenberg syndrome. * apply functional near infrared spectroscopy to explore the mechanism of action of this therapy. Participants received conventional dysphagia treatment and motor imagery based on action observation treatment once a day for 14 days. Researchers compared the control group to see the effect and mechanism of motor imagery based on action observation treatment.