Researchers found that there were three brianwave patterns that corresponded to your level of focus. For me, Visual stimuli kept me focused. Auditory stimuli practically put me to sleep. And Kinesthetic stimuli are transitional for me. In meetings where there is just discussion or words on a chart, I find myself fidgeting, and that helps me stay focused. So I am V-K-A. (The first letter for what keeps you focsed, the second letter for the transitional mode, and the third letter for what causes you to drift into la-la-land.) The research found that the six combinations of these three types of stimuli was equally distributed in the population.
The lesson for teachers and presenters is that you should provide all three stimuli in your presentation so that all people get what they need to stay focused.
Markova wrote a wonderful book called "How Your Child Is Smart". It was fantastic resource for bringing up our children and helping them stay focused in all of the ways they actually learned.