Neurological Evidence of Diverse Self-Help Breathing Trainings with Virtual Reality and Bio-Feedback Assistance

The goal of this research is to learn about the neuro-mechanism beneath breath training, mindfulness meditation, or periods of idleness. This research also focuses on the use of virtual reality (VR) and bio-feedback (BF) integrated assistance system in breath training, and seeks for the potential of generalizing breath training in public. The main questions it aims to answer are: Whether and how people's neuro-mechanism (indicated by EEG indexes) changes when they are performing different breath training techniques (i.e., mindful breathing, guided breathing, and breath counting). Researchers will compare the neuro-markers when participants perform different styles of breath training. Participants will: * Participants will equip an EEG system, a VR headset, a respiratory belt, and a heartbeat sensor. * Participants will perform resting state task, mindful breathing task, guided breath task, and breath counting task respectively. * EEG activity, breath rate, reaction time, accuracy, and HRV will be recorded. Each session will last approximately two hours.