Wemmie's studies have shown that these acid-sensing proteins are required for normal fear responses and for learning and memory in mice. However, while you can buy a kit to measure the acidity of your garden soil, there currently is no easy way to measure pH changes in the brain.
For the normal version of the english typing test we have calculated an average of 41 WPM, this value is based on over 73 million typing results. Considering that these words are relatively easy to type, the avg WPM is probably around 20-25 WPM for normal text with punctutations etc.
There are approximately 250 words per double spaced typed page. More specifically there are between 2,622 and 3818 Characters on a normal 8x10 page depending on Capitalization and Font. This estimation is given for the typical Times New Roman with font size 12.