Forest plot studying the effect of virtual reality on cognitive function. Thapa, et al. 2020 (a) Digit Symbol Substitution Test. Kang et al., 2021 [24], Liao et al., 2020 [25], Park 2022 [26], Park et al., 2020 [27], Thapa et al., 2020 [28], Torpil et al., 2021 [29].