Okay, it's obvious they must have thought in pictures. So when they got hungry they saw food. But, otherwise, what did they think about when they didn't need anything in particular? Did their minds go blank? Is there a picture for, "what should I do now?"
And what about deep thoughts? Could they have any deep thoughts without language? Like, "why do I exist?.....what is my purpose in life?" I don't think you can ask those questions with pictures.
Imagine if a caveman or cavewoman had a preteen son or daughter: They wouldn't be able to have....you know......"the talk". What then? Maybe they just gave them the "grunt".
If they didn't have a word for "yesterday" or "tomorrow", what did they have? How can you think of tomorrow in pictures? Would they be able to plan ahead in pictures?
I'm sure you will tell me about it, those of you who think in pictures, assuming you can find the words to explain it.
What was it like to not have any words, only pictures for thoughts.