Any study of messages at the receiver's stage is known as:

Any study of messages at the receiver's stage is audience analysis, the examination of who receives content and how they take it in.

Communicator analysis looks at the source or sender of a message, standing at the opposite end from the receiver.

Message analysis studies the content itself, its words, symbols and structure, rather than the people at the receiving end.

Noise analysis examines the interference that distorts a message in transit, not the receiving audience as such.

Because the receiver is the audience, studying messages at that point is studying the audience.

Audience analysis guides communicators in shaping content to reach their target effectively.