Posibleng Mga Sanhi para sa Cognitive Deficit Alcohol Abuse Alerdyi sa Pagkain Neurotic Disorder Pineal Gland Cyst Brain Concussion Alcohol Dementia Hyperthyroidism Amyotrophic Lateral Sclerosis Glioblastoma Multiforme Huntington's Disease Polycythemia Vera Non-24 Hour Sleep-Wake Disorder Hyperornithinemia-Hyperammonemia-Homocitrullinuria Syndrome Urea Cycle Disorder Guam Disease Scedosporium na Impeksyon Katamtaman at Malalang Traumatic na Pinsala sa Utak Pagkalulong sa Opiate