Not only are these three dimensions independent of each other, but of one’s Physical Gender as well. That is, a person can have a male body, male Brain Sex and Identity, but have female Brain Gender. [In fact, most writers and artists do.] Such a person would look, act and feel male, but have a female’s sensitivity to emotions, words and sensations: Although, they may overcompensate in public and in interpersonal relationships [e.g., Ernest Hemingway]
Like our Genetic and Physical Gender, our Brain Gender, Gender Identity, and Brain Sex, expression usually remains constant from childhood throughout one’s life.