Please see the discussion on Requests for cleanup for more information and remove this template after the problem has been dealt with. 1  Afep pigeon (Columba unicincta) 2  African owl pigeon (Columba livia domestica) 3  African green pigeon (Treron calvus) 4  African olive pigeon (Columba arquatrix) 5  American pigeon (Patagioenas)
Fatal familial insomnia and sporadic fatal insomnia differ from other prion diseases because they affect predominantly one area of the brain, the thalamus, which influences sleep. The familial and sporadic forms typically begin between the ages of 30 and 50 years.
Credit: Artem Chernyshevych | Stock Xchng. Exposure to a dim light at night, such as the glow of a TV screen, may prompt changes in the brain that lead to mood disorders, including depression, according to a new study in hamsters. patient with major depression has a smaller hippocampus, Bedrosian said. The brain changes in the hamsters might arise from fluctuations in the production of the hormone melatonin, Bedrosian said. Melatonin signals to the body that it's nighttime, but a light at night dampens its production.