Experimental group: VR positive thinking based on PHRI theory

Participants assigned to the experimental group followed the instructions provided in TRIPP to perform positive thinking. Before starting positive thinking, the program provided two short items to collect the user's emotional state, and the program automatically assigned scenarios to the user based on the user's emotional state. The participant is asked to follow the instructions and tasks by controlling the direction of breath flow and attention according to the guided voice and to rate his or her state again at the end of the task. A training session has a fixed length of time to complete, lasting 18 min.