When performances have a strong visual component, such as when pictures or graphics are used to communicate meaningful concepts, this information is processed and stored differently in the brain, compared with text-based presentation. Visual stimulation catches people's attention. Well-used imagery communicates more information than a presenter possibly can say with words alone.
Interactivity gives viewers a sense of control and empowerment. For example, once viewers realize they can direct the speaker down different paths, engagement tends to go up considerably. They see a topic that looks interesting and quickly realize it may not be discussed without their input and involvement.
Tailoring content to the interests of viewers gives them a sense the speaker cares about their perspectives and is not simply performing the robotic task advancing through preset slides. Again, engagement increases.
If a presenter feels in control of content, he or she tends to be more confident in the delivery process. This confidence leads to more enjoyment with public speaking, which, in turn, further draws in the audience as they interact with an energetic, yet relaxed, speaker.
