Quantitative Neurofeedback Techniques for Treating Perioperative Cognitive Disorders in Elderly Patients

"1. Issuance of training equipment and training in its use: For subjects randomly assigned to the intervention group, a volunteer who has received adequate training in the use of the equipment will issue the EEG monitoring electrodes (model: HXD-1) and paired PADs, and will provide an activated account for the use of the subject only and training in its use. Subjects will be provided with a short tutorial on how to use the APP, which is very user-friendly and suitable for elderly novices. An initial training session will consist of 3 training components and will be completed with a volunteer.~2. Training programme and supervision: The closed-loop neurofeedback training will consist of 3 parts, namely Digital Meditation, Brain Training and Sleep Induction. The brain training will consist of three games: Idea Chase, Idea Magic Ball and Focused Archery. The control subjects lived a normal life before the surgery, and all subjects underwent the surgery as planned."