The truth is, those who type do take more notes compared to those who use good old pen and paper. However, according to the new study published by Pam Mueller and Daniel Oppenheimer (from Princeton University and University of California respectively) students who take notes on paper learn significantly more compared to their laptop-addicted peers. Here are the main reasons why:

Writing takes time and digestion is necessary

Our brain uses two different types of cognitive processing when doing these two operations: typing and writing. As tested on a group of undergrads, the research proved that laptop users type almost everything they hear without processing the meaning or devoting much thought to what it is they’re taking notes on. Basically, when you type, all you’re doing is mindlessly transcribing, and that does not require much cognitive activity.

When you take notes by hand, however, you obviously can’t write down every single word your professor utters. So you listen, summarize, and list only the key points. Your brain is more engaged in the process of comprehension and so the information processed this way is remembered better.

That's fascinating. Writing more slowly gives us time to digest the information. Makes sense. 

Possibly the tactile aspect also imprints better

That makes sense to me too, Srini.

All keys feel the same to my fingers but writing each word feels differently.