Mental representations stand for real objects in the world and the real-world objects that representations stand for are called referents.
Mental representation is that the imagination of things that aren't presently seen or perceived by the sense organs. In our minds we regularly have pictures of objects, events and settings.
A referent is that the person, thing, or concept that a word or expression denotes, stands for, or refers to. As an example, the referent of the word door within the sentence "The black door is open" may be a concrete object, a door—in this case, a particular black door.
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