To provide a BCI for performing processes of a plurality of steps for facilitating the specification of the selection and a change of a direct standard perception examination, one or more selections, motions and/or states which are desired by a user.SOLUTION: There are disclosed a method, a system, a device and a non-temporary computer readable medium using a brain computer interface (BCI). A user is allowed to select a solution of a multi-limb formula, provided with control for an electric wheelchair, and can play a game by the BCI. This invention includes a non-corrected standard examination which brings about a result that, in a perception evaluation examination, a format arises which is the same as, or similar to that in the case without using the BCI. The accuracy of a BCI examination is improved by using three processes of an intentional determination of the selection of a user's solution, the monitoring of user's brain activities for the determination of the selected solution, and the verification of the selected solution with respect to each of examination questions. The selected solution monitors and verifies the user's brain activities following a holding/release process for determining an intention of the user whether or not to start a state change.SELECTED DRAWING: Figure 1
BRAIN COMPUTER INTERFACE FOR FACILITATING SPECIFICATION OF DIRECT SELECTION AND STATE CHANGE OF SOLUTION OF MULTI-LIMB SELECTION FORMULA