A cognitive ability detection apparatus (10) includes a visual information acquisition unit (12), a brain signal acquisition unit (13), and a detection unit (14). The visual information acquisition unit (12) is configured to acquire visual information of a subject to a visual stimulus included in video. The brain signal acquisition unit (13) is configured to acquire a brain signal of the subject. The detection unit (14) is configured to detect an event-related potential from the brain signal by using, as a starting point, a video trigger based on an occurrence timing of the visual stimulus, detect whether there is a point of gaze for the visual stimulus from the visual information, and detect a cognitive ability level to the visual stimulus.
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