Corrspondence between Cicero and Cassius Longinus, highly relevant here and perhaps even directly on point. The exchange seems to be joking, but Cassius seems to be denying Cicero's extremely expansive interpretation (intentionally derogatory) reference to the role of images:
QuoteDisplay MoreCassius had recently become a follower of the Epicurean school of philosophy.
[15.16] Cicero to Cassius
[Rome, January, 45 B.C.]
L I expect you must be just a little ashamed of yourself now that this is the third letter that has caught you before you have sent me a single leaf or even a line. But I am not pressing you, for I shall look forward to, or rather insist upon, a longer letter. As for myself, if I always had somebody to trust with them, I should send you as many as three an hour. For it somehow happens, that whenever I write anything to you, you seem to be at my very elbow; and that, not by way of visions of images, as your new friends term them, who believe that even mental visions are conjured up by what Catius calls spectres (for let me remind you that Catius the Insubrian, an Epicurean, who died lately, gives the name of spectres to what the famous Gargettian [Epicurus], and long before that Democritus, called images).
2 But, even supposing that the eye can be struck by these spectres because they run up against it quite of their own accord, how the mind can be so struck is more than I can see. It will be your duty to explain to me, when you arrive here safe and sound, whether the spectre of you is at my command to come up as soon as the whim has taken me to think about you - and not only about you, who always occupy my inmost heart, but suppose I begin thinking about the Isle of Britain, will the image of that wing its way to my consciousness?
3 But of this later on. I am only sounding you now to see in what spirit you take it. For if you are angry and annoyed, I shall have more to say, and shall insist upon your being reinstated in that school of philosophy, out of which you have been ousted "by violence and an armed force."
Quote[15.19] Cassius to Cicero
[Brundisium, latter half of January, 45 B.C.]
L I hope that you are well. I assure you that on this tour of mine there is nothing that gives me more pleasure to do than to write to you; for I seem to be talking and joking with you face to face. And yet that does not come to pass because of those spectres; and, by way of retaliation for that, in my next letter I shall let loose upon you such a rabble of Stoic boors that you will proclaim Catius a true-born Athenian.
2 I am glad that our friend Pansa was sped on his way by universal goodwill when he left the city in military uniform, and that not only on my own account, but also, most assuredly, on that of all our friends. .....