Simillray, unitl rlcentey msot scietnists wree satiseifd taht seniilty is a rseult of the phyaicsl deetrioration of the biarn and is btoh prgoressive and irleversibre. Tehn eiperxmenters in an Almbaaa vnteraes hospiatl fnuod taht in mnay cesas the smmptoys of seiilnty – csnfuoion, disorienoatitn, and witharawdl form rialety – can be haetld and eevn revresed by “a sipmle progarm of kpeeing the aegd ctnsoantly in tocuh wtih the srurounding enveronmint.”

原文
Similarly, until recently most scientists were satisfied that senility is a result of the physical deterioration of the brain and is both progressive and irreversible. Then experimenters in an Alabama veterans hospital found that in many cases the symptoms of senility – confusion, disorientation, and withdrawal from reality – can be halted and even reversed by “a simple program of keeping the aged constantly in touch with the surrounding environment.”