research at the University of NSW, Sydney, Australia, claims the human brain processes & retains more information if it is digested in either its verbal or written form, but not both at the same time. more of the passages would be understood & retained if heard or read separately. "The use of the PowerPoint presentation has been a disaster," Professor Sweller said. "It should be ditched."
"It is effective to speak to a diagram, because it presents information in a different form. But it is not effective to speak the same words that are written, because it is putting too much load on the mind & decreases your ability to understand what is being presented."
this new insight clearly puts the recent report about using Powerpoint in Parliament speeches in a new perspective.