Cognitive impairment diagnostic device and cognitive impairment diagnostic program

A cognitive impairment diagnostic device comprising:

• an obtainer that obtains a distribution map representing a distribution of gaze points of a subject on a movie for cognitive assessment;
• and
• a diagnoser that makes diagnosis of cognitive impairment, based on the distribution map,
• wherein the movie for cognitive assessment includes:
• a first region including a correct image for cognitive assessment or an image for encoding;
• and a plurality of second regions including other images, and
• the diagnoser:
• calculates, in the distribution map on the movie for cognitive assessment, a percentage of fixation duration for which the first region is focused on or a percentage of fixation duration for which at least one of the plurality of second regions is focused on;
• and
• makes diagnosis of whether cognitive impairment is present by comparing the percentage of fixation duration with a threshold.

A non-transitory computer-readable recording medium having recorded thereon a cognitive impairment diagnostic program executed by a computer that obtains a distribution map representing a distribution of gaze points of a subject on a movie for cognitive assessment, and makes diagnosis of cognitive impairment, based on the distribution map,

• wherein the movie for cognitive assessment includes, in time order:
• a first movie including (i) a first region that includes an image for encoding that is displayed in a visually enhanced manner, and (ii) a plurality of second regions that include normal images that are displayed without being enhanced;
• and
• an assessment movie including (iii) a third region that includes an assessment image that is similar to the image for encoding and displayed at a same position as the image for encoding without being visually enhanced, and (iv) the plurality of second regions, and
• the cognitive impairment diagnostic program causing the computer to execute:
• calculating, in a distribution map on the assessment movie, a percentage of fixation duration for which the third region is focused on;
• and
• making diagnosis of suspected memory impairment when the percentage of fixation duration is lower than a threshold.