Table 1.

Comparison of research results.

Study target	Conclusion	The limitation of this study	Causes of limitations	Subsequent research
Negative Emotion and Invasion Frequency	Both methods can induce traumatic memory, even if VR is not as good as TFP.	VR trauma induction time is short and invasion frequency is low.	To ensure that long-term PTSD symptoms are not induced.	Used the VR paradigm to detect avoidance behaviors in different people and environments specifically (Dibbets et al., 2021)
Risk factor 1: Imagination ability	Higher imagination coincides with more virtual reality conditions, higher ability leads to more intrusions (VR conditions), and higher ability is related to less invasion pain (TFP conditions).	There are fewer participants in each case.	This study is the first time used PTSD as an induction method.	Used the VR paradigm to induce intrusive emotions and avoidant behaviors, They found that the VR paradigm increased negative emotions and heart rate, decreased positive emotions and heart rate variability, and observed the symptoms that caused stress (Dibbets, 2020)
Risk factor 2: Trait anxiety	None	Participants are non-clinical people, so it isn't easy to popularize the results to clinical people.	For humanitarian reasons, we cannot induce negative emotions in clinical people.
Risk factor 3: Depression	None	Questionnaire related to risk factors has a limited range of changes.	There is no pre-selected experimental participant.