That reminds me of reading the original Tarzan from 1912, in which Burroughs writes of how a boy raised in the jungle with only animals for company came to be able to read (and only later speak) English, all on his own.

Quoting for memory, after Tarzan finds some books and newspapers as a result of someone’s previous tragedy in the jungle: “Tarzan, being of superior intellect by virtue of being born to English parents, was able to figure out the meaning of the symbols he found in the books and realized they were forming words and sentences,” from which he not only learned to read English but also devoured the books (textbooks?) and their content.

The treatment in the actual text of the book is rather different, and goes into some delightful detail concerning Tarzan's self-study program, which begins at the age of 10 or so:

  "Among the other books were a primer, some child's readers, numerous picture books, and a great dictionary. All of these he examined, but the pictures caught his fancy most, though the strange little bugs which covered the pages where there were no pictures excited his wonder and deepest thought."

These are materials his parents has gathered to take to their Colonial posting for the express purpose of educating their infant son over the next several years; he just gets a rather late start on the program.

  "He did not accomplish it in a day, or in a week, or in a month, or in a year; but slowly, very slowly, he learned after he had grasped the possibilities which lay in those little bugs, so that by the time he was fifteen he knew the various combinations of letters which stood for every pictured figure in the little primer and in one or two of the picture books."

He takes several more years to piece together some of the mysteries of verbs and modifiers... I've always found it a fascinating thought experiment about language formation, given the era. In this context, I suppose the Hollywood presentation of Tarzan could be considered an application of the critical period hypothesis (had it existed at the time).

In less ethical times there have been experiments with children left to raise themselves in contained environments to discover - among other things - how people learn to speak, but unfortunately the experiments always ended in disaster because the moderators were unable to devise a method whereby they could guarantee the survival of the subjects but without influencing their behavior.

While it’s still cheesy. It’s meant to be a montage of many evenings.

More explicitly shown by rain during one night. Personally, I liked this better than usual shtick of people just suddenly speaking a new language.

I thought this worked pretty well in hunt for the red October. The ol’ mouth zoom