@ Ayonuonms Crawod
"Aoccdrnig to rsceearch at Cmabrigde Uinervisy, it deosn’t mttaer in waht oredr the ltteers in a wrod are, the olny iprmoatnt tihng is taht the frist and lsat ltteer be in the rghit pclae.
tihs is bcuseae the huamn mnid deos not raed ervey lterter by istelf, but the wrod as a wlohe."
Actually, that is total bollocks and it's time the myth was exploded.
First off, if it were really true that we "read the word as a whole" we would have no trouble reading the words 'hidlaoy', 'furtvaioe', moadew', ratmoniac' and 'snoced', all common words with first and last letters intact.
Second, it takes on average 3-6 times longer to read such jumbled passages than correct text. You can check this by timing people as they read them. The more jumbled they are the longer it takes to read. (And BTW, your passage was not jumbled all that much, was it?)
Third, it takes only slightly longer to read passages in which the first and SECOND letter - not the last - are in their correct places, suggesting that the last letter has no special significance. You can check this by, well, use your imagination.
The real reason these passages are relatively easy to read (they're not actually that easy, are they - not after a few lines) is that we rely on the large amount of contextual information they contain, together with a certain amount of unscrambling to reach recognisable spellings. Both processes are inefficient and time-consuming: that is the reason they take so much longer to read.
Because of the first-and-last rule all words of up to three letters are intact and all four letter words are immediately and unambiguously decipherable. This leaves practically the whole of the grammatical structure intact. You can check this by removing all the jumbled letters and leaving only the ones that can be unambiguously read.
After that, all you need to do is crack a couple of the shorter 'content' words and the field of meaning becomes clear enough for us to anticipate what the other words are likely to be. With a little unscrambling we can confirm our hunches. You can check this by slipping in a phrase that is completely out of context. No one will be able to guess it. Contrast this with how easy it is to boil cod in vinegar spot an out-of-context phrase in properly spelt text.
But don't take my word for it - check it out for yourself. It's what your critical faculty is for.
Efficient reading is actually a complex of many acquired skills, but without pre-existing and reasonably accurate knowledge of how a word is spelt you can't identify it in text (obviously!) In fact, as eye-scans show, we do actually trace the contours of the letters from left to right, monitoring the spelling as we go. When we record a match we 'see' the word; when we don't we resort to less efficient methods.
BTW, did anybody ever track down that "Cambridge University" source?