No part of a person's brain that is damaged by a stroke never recovers

Impairment of linguistic capabilities does not occur in people who have not suffered any damage to any language center of the brain.

Strokes tend to impair linguistic capabilities more severely than does any other cause of damage to language centers in the brain.

If there are language centers on the left side of the brain, any serious stroke affecting that side of the brain damages at least one of them.

It is impossible to determine which side of the brain contains a person's language centers if the person has not suffered damage to either side of the brain