Final answer:
Proto-humans and animals like chimpanzees could have clear, distinct mental concepts without words by relying on machine learning and pattern recognition.
Step-by-step explanation:
The question explores the intriguing question of how proto-humans and animals like chimpanzees could have clear, distinct mental concepts without words. Proto-humans likely had conceptual clarity before mapping those concepts to speech or written symbols. They might have relied on machine learning and pattern recognition to recognize and understand concepts like fruit, nest, or branch strength. While statistical pattern recognition doesn't imply a clear concept, it is possible that proto-humans used these patterns to form mental representations.