Method for diagnosing cognitive disorder, and computer program

A cognitive impairment diagnosis method comprising:

• receiving an electroencephalogram signal of a user by a cognitive impairment diagnosis device;
• preprocessing the electroencephalogram signal by the cognitive impairment diagnosis device;
• extracting features, by the cognitive impairment diagnosis device, from the preprocessed electroencephalogram signal by using a brain connectivity-based analysis method;
• inferring, by the cognitive impairment diagnosis device, a degree of atrophy of each part of cerebral cortex and a degree of ischemic damage of cerebral white matter of a user, using at least one selected from a current concentration in each frequency band, an absolute power in each frequency band, a relative power in each frequency band, ratios between the frequency bands, and a statistical comparative data with values of a normal person of the same age;
• determining, by the cognitive impairment diagnosis device, a cause of the cognitive impairment as a neurodegenerative cognitive impairment disease when the degree of atrophy of each part of the cerebral cortex is greater than the degree of ischemic damage of the cerebral white matter;
• and
• determining, by the cognitive impairment diagnosis device, the cause of the cognitive impairment as vascular dementia when the degree of atrophy of each part of the cerebral cortex is less than the degree of ischemic damage of the cerebral white matter.