While most cases of cerebral palsy are linked to trauma of the brain or lack of oxygen during birth, there are some cases of cerebral palsy that may also show a genetic link. Often the genetic link is not immediate, but rather a member of the mother's family had some form of mental disability or has a history of difficulty with fine or gross motor skills. Mothers that do have some form of mental disability have a greater chance of having a baby with cerebral palsy than mothers that don't have a diagnosed mental disability. In addition cerebral palsy tends to occur in families that have a history of the condition much more frequently than in families that don't, however the high rate of medical mistakes that lead to cerebral palsy also needs to be taken into consideration. Some research has shown that different groups, especially those living in isolated conditions, may have a higher rate of cerebral palsy than mainstream populations. There is also research that seems to indicate that some genetic conditions that may limit or restrict blood flow to the brain during fetal development may also result in cerebral palsy, particularly when combined with some type of trauma or injury before, during or within a few days after birth.