masakazu is currently researching this field.hat the rejection of masks is due to a physiological reaction of the brain, not due to stubbornness or lack of tolerance. >> translator: i think it is possible that there is a strong reaction within the brain that makes it difficult to wear masks. so no matter how manany times o tries to get used to wearing the mask we may still see no improvement. >> this mother tried coaxing her child with various face masks but he refuses to put a any of them on. >> reporter: these symptoms of sensory hypersensitivity are also reported in those with alzheimer's disease or depression. however, there is no accurate tally of how many people are unable to wear masks for such physiological reasons. teenager cato jie is trying out new ways to help out those whose bodies reject masks. kato himself suffers from sensory hypersensitivity of taste and smell. this january he started a website to raise awareness of sensory hypersensitivity. it's also a platform for those with the same problem. >> translator: it'