But the sheer number is not the important issue, it is how richly interconnected the neurons are that determines intelligence. And learning something means establishing connections and well as losing some neurons.
Think of the brain's neuron as a field of marbles, all the same shape and color. When presented with it, what would one see? A uniform field of marbles.
Now, take away some, selectively, leaving the other ones as they are, and you can make a drawing.
The brain intelligence is as much about mentioning the word "food" and having evoke "lunch" as it is not evoking "trombone". The neuron that connects the "food" concept with "lunch" concept are of the brain is as important as there NOT having the neuron connecting it with "trombone".
Even though, now, this very evocation has triggered it.
So, yes, having more neurons is somewhat linked with higher intelligence, as long as those are the properly connected ones. Having badly connected ones will just make you less smart and more confused.
Suggestion:
It's not the number of neurons when comparing 2 brains of the same species, it's how well those neurons are interconnected in the brain.
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