Without Miracles: The Development and Functioning of Thought - 0 views
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it might come as somewhat of a surprise to learn that some scholars reject natural selection as an explanation for the appearance, structure, and use of language.
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to use Darwin's term, the roll film of the still camera was preadapted, although quite accidentally and unintentionally, for use in the motion picture camera. To use Gould's more neutral and more accurate terminology, this feature of the still camera was exapted for use in motion picture cameras. So, in effect, Chomsky and Gould assert that the human brain is analogous to roll film in that it evolved for reasons originally unrelated to language concerns; but once it reached a certain level of size and complexity, language was possible.
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All mammals produce oral sounds by passing air from the lungs through the vocal cords, which are housed in the larynx (or "Adam's apple"). The risk of choking to which we are exposed results from our larynx being located quite low in the throat. This low position permits us to use the large cavity above the larynx formed by the throat and mouth (supralaryngal tract) as a sound filter. By varying the position of the tongue and lips, we can vary the frequencies that are filtered and thus produce different vowel sounds such as the [i] of seat, the [u] of stupid, and the [a] of mama.[9] We thus see an interesting trade-off in the evolution of the throat and mouth, with safety and efficiency in eating and breathing sacrificed to a significant extent for the sake of speaking. This suggests that the evolution of language must have provided advantages for survival and reproduction that more than offset these other disadvantages.
