When analyzing her audience, she needs to consider the group membership of which she needs to have them feel like they belong or somewhat have them be a part of her speech in order to gain their attention and to keep them from being interested to her as she tells them her persuasive speech.
When a cognitive function relies on one cerebral hemisphere more than the other, this phenomenon is known as lateralization.
This means that each side of the brain specializes in some things and works harder on those things than the other side and some neural functions or cognitive processes are specialized to one side of the brain or the other.