Eli5: If we use language as instrument of thoughts, how did our ancestors think?

Question

Eli5: If we use language as instrument of thoughts, how did our ancestors think?

In: 8

Answer 1

It is possible that spoken language developed and became complicated as our brains became larger. I’ve read that the Neanderthal had larger brains but limited speaking ability. This was due to the structure of the vocal mechanism. But there could be more information discovered that suggests this is not correct