the title of a part of a book is: mental representation introduced
what does it exactly mean? i know about mental representation, my problem is the word "introduced". and what is the structure of this sentence in grammar?

mental representation introduced This is not a complete sentence. It's just a phrase.

It tells the reader that the writer is going to introduce the concept of 'mental representation' in this part of the book.

introduce something means talk about it for the first time.