In most of fire evacuation, people follow the walls. The reasons behind this escape behavior have not been verified by experiments. In this article, we design a virtual reality (VR) fire evacuation game with realistic virtual environment to explore the effects of smoke concentration, individual familiarity with the environment, and neighbor behavior on individual wall-following behavior.Individuals' familiarity with the environment is obtained through experimental training and the frequencies of their behavior along the wall at different smoke concentrations are recorded. From a subjective perspective, we use the presence scale to assess the immersion of the designed VR game. The results show that users have a good level of presence in the designed VR game. From an objective perspective, we analyze the game data using a statistically based approach. The analysis shows that high concentration of smoke, unfamiliar with the environment will increase individuals' reliance on walls, but neighbor behavior along the wall has no significant effect on individual wall-following behavior.
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