Tools like Microsoft PowerPoint negatively impact student learning
esciencenews.com
esciencenews.com
Lectures can be poorly designed in any medium.
"It's not the tool. It's the people who use it"
And here's the original research document. http://isedj.org/7/82/Mahar.j.txt
And one more thing. The article provides very poor referencing. I couldn't find the real source by following the link they have given as the source. In contrast following article is better IMHO.
http://www.hg2s.com/blog/2009/06/11/the-danger-of-gratuitous...
For a far better criticism of powerpoint check out Edward Tufte: http://www.edwardtufte.com/bboard/q-and-a-fetch-msg?msg_id=0...