in die ander 40% kan dit deur n kopbesering, besering tydens die geboorteproses, alkoholen dwelmmisbruik, veroudering of n metaboliese of biochemiese versteuring of wanbalans veroorsaak word.

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.
