I'd really question the idea that a person even "has" ideas rather than responds to the world ("internal" and "external") in specific patterns after specific ex

I'd really question the idea that a person even "has" ideas rather than responds to the world ("internal" and "external") in specific patterns after specific experiences. But if you must, a person is a body, so it's the body that has the ideas and as far as anyone else cares, a body's appearance, actions and intentions are the only thing they could really care about.