Abstract: Disclosed is a method of identifying dementia by at least one processor of a device. The method includes performing a first task that causes a first object to be displayed on a first region of a screen displayed on a user terminal; and when a preset condition is satisfied, performing a second task that causes at least one object, which induces the user's gaze, to be displayed instead of the first object on the screen of the user terminal.

Abstract: A method of identifying dementia is disclosed that includes causing a user terminal to display an N-th screen including a plurality of objects. The user terminal may further display an N+1-th screen with the objects rearranged at positions on the N+1-th screen which are different from positions of the objects included in the N-th screen when an N-th selection input of selecting any one from among the objects included in the N-th screen is received. When an N+1-th selection input for selecting any one from among the objects included in the N+1-th screen is received, a third task of determining whether an answer of the N+1-th selection input is correct is performed based on whether the object selected from the N+1-th selection input is the same as at least one object selected from at least one previous selection input including the N-th selection input.

Abstract: A motion gesture sensing module includes a light source emitting light, and a light sensor unit including at least two optical detectors sensing light reflected from a subject, in which an optical block is disposed in a light receiving path of the light sensor unit and individually separates a detectable zone of each of the optical detectors, thereby determining a motion or gesture of the subject based on output of the light sensor unit. Further, a motion gesture sensing method is a contactless motion sensing method, in which a light source emits light, light reflected from a subject is received by at least two optical detectors, and output values of respective optical detectors are compared to determine a motion of a subject, thereby sensing motion gesture of the subject by individually separating a detectable zone of the optical detector and receiving the light reflected from the subject.