Online Anti-Spell Checker

Some years ago this text circulated on the Internet:

Aoccdrnig to a rscheearch at Cmabrigde 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 be at the rghit pclae. The rset can be a toatl mses and you can sitll raed it wouthit porbelm. Tihs is bcuseae the huamn mnid deos not raed ervey lteter by istlef, but the wrod as a wlohe.

I thought that was pretty interesting and tried to find more info on the topic - without luck. According to several sources no such study had been performed at Cambridge University. However, I did find a reference to another source.

Randomising letters in the middle of words has little or no effect on the ability of skilled readers to understand the text.

Reference: Rawlinson, Graham. E. (1976) The significance of letter position in word recognition. Unpublished PhD Thesis, Psychology Department, University of Nottingham, Nottingham UK.