**2.1 Eligibility criteria**

Out of variables controlling, this review merely focuses on studies asking subjects to use MI to control a BCI game. In detail, we select experiments with all healthy and disabled human participants using MI solely to control a BCI device to play a game (actively non-invasive MI-BCI). The BCI device must be non-invasive. Additionally, metrics cover both quantitative and qualitative learning outcomes. A Hybrid MI-BCI control system, BCI for assessing MI function, or no human experiment would exclude. Summarization of all the critical aspects of the eligibility criteria is presented in **Table 2**.
