Just wondering if a similar phenomenon also doen't happens in the spoken languages. Different accents are not a kind of change in the prononced letters? When are we familiar with an accent, we understand the words, doesn't matter how the  letters are prononced?

Hello, I have read this in a study done by a famous institute, showing that we take the picture of the word or the sentence before the spelling, so that means the image is very important in learning something,

here is another one by the same source of our friend Joao:

Typoglycemia
Aoccdrnig to a rscheearch at an Elingsh uinervtisy, it
deosn't Mttaer in waht oredr the ltteers in a wrod are, the
olny iprmoetnt tihng is taht the frist and lsat ltteer is
at the rghit pclae. The rset can be A toatl mses and you
can sitll raed it wouthit porbelm. Tihs is bcuseae We do
not raed ervey lteter by it slef but the wrod as a wlohe.

Never show this experiment to my pupils!

Works! or better: Wrkos?!

Thanks for your impressions, @misha, @Liza, @Lynn and @Katya. It seems  that spelling is not so important. At least, to undestanding  what is writen :))))))). @Lynn is right. It is easier to understand than to write in that way. @Liza also have a good point. It works for russian and, I think, to all languages.