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.