Powerful speakers seldom use slides, ordinary people like me rely on PowerPoint slides to get the job done badly , when not having a strong compelling case :)
The fundamental reason is that speech are more powerful than visual presentation. When people listen their subconsciousness is activated and they tend to accept things told (think about Hypnosis), when people open their eyes their brain kick in and start analysis, they won't listen. Slides also get in the way of speaker's body language, which is another most import factors in communication.
The use of PowerPoint in class and training process is also debatable. When in college, I could understand quite clearly the fundamental principles when my professor used the tradition chalkboard to go over the equations, however, I could hardly remember any of those equations and bullet points shown using slides.
The fundamental reason is that speech are more powerful than visual presentation. When people listen their subconsciousness is activated and they tend to accept things told (think about Hypnosis), when people open their eyes their brain kick in and start analysis, they won't listen. Slides also get in the way of speaker's body language, which is another most import factors in communication.
The use of PowerPoint in class and training process is also debatable. When in college, I could understand quite clearly the fundamental principles when my professor used the tradition chalkboard to go over the equations, however, I could hardly remember any of those equations and bullet points shown using slides.