To say that we have "a genetic language capacity" is not to say very much.
To explain why languages that developed in isolation from one another are so similar requires invoking an underlying language capacity.
A capacity that allows the creation of similar expressions of language.
Like building a similar nest requires an underlying nest building capacity.
That it has a genetic basis is pretty much a given.
That there is a specific language capacity is not a given.
There are even some who deny it.
Gorillas and chimps couldn't be made to play football or chess. Do you think that this shows that human beings have two very specific capacities, one to play football and one to play chess?
My position is the ability for two people to play chess only exists because of the language capacity.
If some organism cannot learn a language, if it is not human, it cannot play chess.
Chomsky's position is mathematics exists because of the language capacity.
Sure, but we seem to have many skills that develop this way.
Yes, like walking.
There must be a walking capacity to allow a human to walk.
A walking capacity is an incredibly complicated capacity. The cerebellum that has fine control over movement is incredibly complex.
There must be a visual capacity to allow a human to see. Again a very complicated capacity. Most of the cerebrum is devoted to this capacity.
And there must be a capacity to allow the complexity of language.
Ultimately in the absence of language the idea of cognition is difficult to understand.
There are the spatial capacities, the ability to deal with objects in space, either seen or imagined.
But the language capacity may be the capacity that allows advanced cognition beyond a chimp.
It probably is that the language capacity allows for advanced cognitive capacities as opposed to advanced cognitive capacities creating a language capacity.
So if this first individual with a language capacity survived and prospered because of it without using it for language it wouldn't be a capacity specific to language.
Definitely.
Chomsky thinks it really is a thinking capacity. A capacity that allows for better thinking. Due to it's nature that allows for better thinking and the nature of pre-humans that were already using sound for communication it was able to be utilized as a language capacity. Soon those with it could communicate to a degree with language. The labels and concepts would be limited at first. This was a great advantage and a way to easily spot a person without the capacity. This is how those with the capacity came to completely eliminate those without it. Like humans wiped out the Neanderthal.
The thinking capacity that allows for language is likely the mathematical capacity as well.
The musical capacity as well.
It is a general capacity that can be used for a few things.
But it is called the language capacity when discussing language. It is probably the same capacity used when a person solves a mathematical problem.