in the other 40%, it can be caused by a head injury, injury during the birthing process, alcohol and drug abuse, aging or a metabolic or biochemical disturbance or imbalance.

ka go 40% ye nngwe, bo ka hlolwa ke kgobalo ya hlogo, kgobalo nakong ya pelego, tšhomišompe ya bjala le diokobatši, go gola goba khuduego ya tšweletšo goba ya go se lekanele ya maatla mmeleng goba payokhemikhale.
