Cognitive archaeology and clever chimps

The archaeology of human thought and intelligence was the subject of my lecture this morning.  Moving on from the functionalist processual approach of Binford in the 1960s (sort of a mathematic, scientific approach to archaeology), people started to consider how to reconstruct the ancient mind.  We looked at Paleolithic toolkit developments, cognitive evolution, and Mithen's theory of cognitive 'modularity', which suggests that at one point in time our brains switched from thinking from modular thinking (i.e. like a monkey seeing a 
python as dangerous, but not linking fresh python tracks to the possibility of danger), to our brains being an information processor.

Mithen's idea has since been refuted by archaeologists, but it's a very good question: how did our brains come into being today, and are they similar to our ancient people's brains? In what respects did they think like us, and how did it differ? A few days ago I saw this programme on iplayer:


In the video, Ayumu the chimpanzee is challenged to memory tests that get as hard as memorising a set of number faster than the blink of an eye.  This got me wondering; how can a chimpanzee have the ability to do this more successfully than the average human? Is it a physical difference in brain function (such as being able to see the numbers for longer because of neural passage from the eye to the brain being wired differently or 
being more adept than ours); or was a cultural difference, such as the fact that for us numbers are associated with meaning - Ayumu may see the numbers as shapes, and so can process the numbers without the associations our minds have with them?

There is the question of training to the programme, but in such a short space of time I doubt many humans or chimpanzees would be able to improve from practise, and if there is an element of luck to Ayumu's success, it is probably minimal in comparison with skill. Either way, I feel very forgetful in comparison. Perhaps we shouldn't be so quick to think ourselves as more clever than our hominidae fellas that share a large percentage of our DNA.